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A: Choose the correct options. Relative Clauses exercises 2 คลคคารหes iIs the teacher which/ who broke his leg on the field trip. He still can't walk properly. the number 3ปse $ Place is the cafe that/ where worked during the summer holidays. I saved a lot of money. . L0ok That's the guy that/ which cheated in the exam. He still got bad marks though. -าeres the text book where/ that you left at my house. Now you can do your homework. บ0you remember the number of the room which/ where the exam is today? r'm so stressed I can't remember anything. 9. This is the computer which/ where always goes wrong. Someone should fix it. 6. Use the prompts to write sentences with relative clauses. 1. football/ a sport/ is cheap and fun 2. a pupil/ a child/ goes to primary school 3. a tattoo/a picture under your skin/ never disappears 4. Mrs. Kemp/ the teacher/ always gives us lots of homework 5. Oxford/ the city/ has the oldest university in the UK 6. the Japanese/ the people/ invented sushi 7.an architect/ a person/ designs buildings 8. an ice rink/a surface/ yoน can ice skate C: Cross out the relative pronoun where it is not necessary. 1. If Mum can't pick me up from school, I get the bus which stops outside our house. 2. ("ve written down the phone number of the private tutor that my cousin recommended. 3. This is the hospital where was born. It's much bigger now than in the past. 4. Can you buy some apples, some cheese and the eggs that say "organic" on the box? 5. This is the puppy which I chose. Isn't he cute? D: Complete the sentences with relative pronouns. 1. This is the bag | bought on Saturday. lost the MP3 player? we ate lunch last week. you bought? taught us last week. T have my English lessons. 2. Where is the student 3. Take me to the place 4. Can see the new phone 5. This is the teacher 6. That is the classroom

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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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