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8. hope to get good ค น ภา 1. Did you e. you taking this vear? 1. Thursday afเernoons in the library. 9. pass or fail? 3 Complete the paragraph with the words in the box. Use the simple past. be ปัท) find า finish วๆ get go ปี live want ๆ move When Chang was young, his family (1.) in a small town. When he was eight, they (2.) -to Shanghai, Chang (8.) "2 a good education there. He (4.) to become a computer programmer. He (b.) college when he was 20 years old. Then he (B.) to New York City for a job interview. Chang (7.) very lucky, and he got the job. He also (8.) a cheap apartment, which was also very lucky. Chang invited his parents to visit him, but it was too far for them to travel. 6 Read more about Chang's life. Underline the regular simple past verbs. Circle the irregular ones. For many years, Chang worked very hard. Sometimes he forgot to eat lunch because he had so much Work to do. He rarely slept because he stayed late at the office. He liked his job and he enjoyed going out with friends on the weekend, but he wondered what other jobs he could apply for. He also wanted to visit his family in China, One day, Chang saw a job posting online. A school needed an IT instructor. The school was in Shanghai! Chang did not know what to do. He had a big decision to make.... Lessons Learned

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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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VOCABULARY DEVELOPMENT Word-building (2) 1 Look at the words from Unit 5. Use a dictionary to identify what part of speech each word is. STUDY SKILแL Suffixes Identify the part of speech of a word (verb, noun, adjective, or adverb) to help you understand the meaning and develop your vocabulary, for example: inform (v), information (n) informal (adj), infoirmally (adv) forget greatly invitation international renewable criticism really enjoy 2 Complete the table for each word with one example of each part of speech. Mark the stressed syllable. Use your dictionary to help. Read STUDY SKILL Suffixes give you clues to the part of speech, for example: " -tion, -ism, ment, ity, ness are noun suffixes, for example, invitation " -al, -ful, -able are adjective suffixes, for example, jnternational " -ly is an adverb suffix, for example. formally verb adjective adverb noun think hopefuly pain pleasure critical 3 Read STUDY SKILแ Match meanings 1-10 with prefixes a-j. STUDY SKILแ Prefixes Use the example words in italics to help. a auto- autobiography antiseptic bilingual d micro- microphone misprint f multi- multimedia Adding aprefix changes the meaning of a word. Each prefix has a different meaning and can be found as a separate entry in the dictionary. For example: mis- means wrong or not e.g. misunderstand. bi- means two or twice, e.g. biannual (twice a year). 1 against 2 wrong: not b anti- 3 | small/tiny ( bi- 4 |after | two/twice under 5 e mis- 6 across; change again 9 8 post- postgraduate h re- 7 8 review | by itself/oneself i sub- submarine 10 many j trans- transform 4 Complete definitions 1-10 with an example word from exercise 3. is to change something completely. is a piece of electrical equipment that is used for making sounds and 1 To 2 A voices louder. 3 Someone who is can speak two languages equally welL. 4 A liquid or cream which stops a cut becoming infected is called an 5 A type of ship which can travel underwater is a 6 To your work is to look at it again to make sure you understand. 7 An is the story of a person's life written by that person. 8 A is someone doing further studies at a university after his or her first degree. 9 is using sound, pictures, and film as well as text on a screen. 10 A is a mistake in printing or typing. 32 Unit 5 - Conferences and visits

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