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HN) Exercises (1)You take 200 milligrams of a headache medicine, and after 4 hours, 120 milligrams remain in your system. If the effects of the medicine wear off when less than 80 milligrams remain, when will you need to take a second dose, assuming the anmount of medicine in your system decays exponentially? 13 ส.ค. The half-life of Radium-226 is 1590 years. If a sample initially contains 200 mg. how many milligrams will remain after 1000 years? )The half-life of Fermium-253 is 3 days. If a sample initially contains 100 mg, how many milligrams will remain after 1 week? บ้อ The half-life of Erbium-165 is 10.4 hours. After 24 hours a sample still contains 2 mg. What was the initial mass of the sample, and how much will remain after another 3 days? The half-life of Nobelium-259 is 58 minutes. After 3 hours a sample still contains10 mg. What was the initial mass of the sample, and how much will remain after another 8 hours? (6) A scientist begins with 250 grams of a radioactive substance. After 225 minutes, the sample has decayed to 32 grams. Find the half-life of this substance. A wooden artifact from an archeological dig contains 60 percent of the carbon-14 that is present in living trees. How long ago was the artifact made? (The half-life of carbon-14 is 5730 years.)

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Exercise 7: Complete the dialogue below. a. I'd like to make an appointment with Mr. Brad. b. 0.K. Good bye. C. May I help you ? d. Would you like to leave a message ? e. Can you tell me your number ? Secretary : ABC. Company. Robert : Good morning. I'm Robert Blacks, a manager of Thailand Computer Service. Secretary : I'm sorry. He won't be in until 11 oclock. Robert : Oh! Yes. Please tell him to call me back. Secretary : All right. Robert : He's already had it. Secretary : Robert Good bye.

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จุดประสงค์การเรียนรู้ 3 เลือกข้อความที่เกี่ยวข้องกับสื่อที่ไม่ใช่ความเรียงได้ (ข้อ 1-10: 5 คะแนน) You can see the following notices in different places. Match the notices 1-8 with the places A-H. 1 There will be one interval of เ5 ทminutes, PLEASE LEAVE YOUR ROOM BY 11 AM. Visiting hours 10.00 am-11.30 am and 5.00 pm-6.30 pm. 3 4 HARD HATS MUST BE WORN AT ALL TIMES. 5 Buy two and get the second half price. 6 PLEASE STAND BEHIND THE YELLOW LINE. 7 Tiredness can kill: take a hreak. 8 Flight now boarding at gate 17. A Hotel E Station platform B Motorway C Constrนuction site F Supermarket G Airport D Theatre H Hospital 1. 2. 3. 4. 5. 6. 7. 8. PAGE 1

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1.4 Everyday English Giving/Reacting to news b) Explain the words in the Check these words box. Then complete the sentences with the correct form of Check these words the verbs in Read the example. Use the language in the box and the facts below to act out Current rate, become extinct. brackets. rise, rapidly, Imelt, habitat, lose similar exchanges. 1 If deforestation (continue) Giving news Reacting to news at the current rate, the rainforests ๑ Oh, how awful. You won't believe this! Listen to this! ๑ Oh, no! Did you That's (disappear). unbelievable. 2 If we (recycle) one That's terrible. aluminium can, we (have) Is that true? That's a pity! know that .? enough energy to run a TV for three hours. (do) more to Are you That's a serious? shame. 3 Unless we help the environment, many endangered species (become) extinct. A leaky toilet can waรte 340,000 litres of water every yeaT. 4 Sea levels (rise) rapidly if At least 30 milion acres of rainforest are lost a year. (melt). the polar ice caps ไess than 1% of Chinese cities have clean air. 5 Unless we (act) now, We (not/have) fresh air in the future. eople cut doพn more than 3 billion trees a year. 6 Many birds (lose) their habitats It takes 450 years for a plastic bottle to biodegrade. unless we (stop) cutting down trees. Speaking & Writing A: You Wont betieve this. A (eaky toilet can Waste 340,000 titres of water every year. 8: Are ycu Serous? 6 a) In three minutes, write three things you remember from the text. Then tell your partner. Grammar b) THNK In your opinion, which Conditionat type 1 environmental issue is the most serious? 5 3) Read the box. Find examples in the text. When do we use conditional type 1? Why? In three minutes, write a few sentences on the topic. Read them to the class. c) ICT H - Eresent Simple + aill + Sase for of the maiส rerd Use the Internet and/or other available ปseะ to tk aboutapssble Suaton nthe present or future. resources to prepare 3 presentation on ways to help protect the environment Note: Unless = H not Use these key wordระ hela the

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ke about markets? Boston Market Wins More Customerร Boston News 7 Haymarket vendors have a reason to celebrate. Their market is becoming more popular than ever. says (This is the busiest market in Boston! Vicky Green at her fruit stand. All the locals come close to downtown. It also has here because its very Convenient hours and the best prices in Boston! For hundreds of years, Haymarket has been the best place to buy fruits and vegetables in Boston. Vendors started gathering in this area of Bostons North End in the mid-1700s. The market grew larger in the nineteenth and twentieth centuries, but almost wholesalers weren't able to sell to grocery stores. "Just remember that the fruits and vegetables are usually very ripe; says Stacy Mills, 30, 'so you need to eat them SOon. But you can get a lot of produce for a great price. And the vendors are much friendlier than salespeople in a supermarket." 4 disappeared when highway construction disrupted the street in the 1990s. The street is now filled with produce stands selling fruits and vegetables from all over the world. And customers love it. Prices here are often cheaper 3 than in the grocery store, so you can find some great In every grocery store you always find the same products, says Eileen Fisher, 21. Iprefer Haymarket because I can get some really exotic food here, for example, from Asia or North Africa. And there are many market stands to choose from The future has never looked better for Haymarket. It has truly become a Boston tradition! bargains, explainsร Nick Baines, 16. This is because vendors sell the produce that nearby

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1.Do the cats climb the trees? 2. Does) father drive to Work? 3.Does) he play the guitar? 4. (Does the baby drink milk? 5.CD) gou like dogs?

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Underline phrases in these sentences. 1. There is one thing to cook breakfast every day. 2. is there anything to do before sunset? 3. | have no money to give you now. 4. | am very glad to have him back here in time. 5. | forgot buying a bottle of milk. 6. Tom stopped to smoke. 7. Living a simple life without competition can bring you peace of mind. 8. Tom is good at playing football. 9. The knowledge is learning something every day. 10. The gentleman crossing the street is an old friend of my father's. 11. Bill and Mary, hoping to pass this course, are working very hard. 12. Many tourists having stayed in Thailand like the hospitalities of Thais. 13. The students marching along, the people stood on both sides of the road. 14. Supported by the people, President Reagan made sure that he won the election. 15. President Reagan, Supported by the people, made sure that he won the election

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12:28 "น 16.0 KB/S - phr.v.get Phrasal verbs: get Choose the correct particle. 1 A: Could youน get on/through the phone to Jack and ask him to come here? B: Yes, of course. I'll call him right now. 2 A: She always leaves work early.I don't know what she gets on/up to. B: Oh, you don't need to worry about her. 3 A: Could get off/back to what was talking about? B: Sure! Sorry linterrupted you. 4 A: Excuse me. How do get to the post office? B: You need to get off/on at the next stop and the post office is across the street. = อ.

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CLICK! Magazine Young Photographer Contest 2 5 Every year at CLICK! Magazine, kids from all over the country send in photos for our fantastic contest. Here are this year's winners! The best วhoto in each category won a digital camera. 1 People Photographer: Lucas Subject: My sister Lucas says: On August 5 we were driving to Canada for our summer vacation. I took this picture of my sister, Laine, in the back of our car. It was a long drive, and she wasn't enjoying it. CLICK says: Lucas's photo is interesting and fนทny. You can see his sister's thoughts in her face. What was she thinking? How was she feeling? This photo really tells a story. a