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Exercise 4: Choose the best answer for each of the following sentences. 1. We should use reusable water bottles ______________ of plastic ones. a. because b. instead c. despite d. however 2. Walking to school will help ______________ air pollution. a. refill b. reuse c. recycle d. reduce 3. We should go to school by bike to ______________ the energy. a. save b. protect c. pollute d. spray 4. The prefix re- in the word reuse means ______________. a. again b. none c. for d. against 5. One of the bad things about ______________ is that it can make fish die. a. noise pollution b. soil pollution c. water pollution d. air pollution 6. We should find creative ways to reuse old items before ______________ them away. a. breathing b. washing c. hearing d. throwing 7. If there is an earthquake, the villagers ______________ in the shelter. a. will stay b. stay c. stayed d. would stay 8. The town will flood if there ______________ a downpour. a. would be b. is c. was d. will be 9. If the weather ______________ good, Linh ______________ out with us. a. is - goes b. will be - goes c. is - will go d. will be - will go 10. The bear ______________ you if you ______________ it. a. attacks - provoke b. will attack - provoke c. attacks - will provoke d. will attack - will provoke Exercise 5: Use the words given to make a conditional sentence - type 1. You can add some words and make necessary changes. 1. If / burn / rubbish, / produce harmful smoke. 2. If / reuse bottles, / save a lot of money. 3. If / use recycled paper, / save trees. 4. If / plant trees in the schoolyard, / school / green place. 5. If / rubbish bin in every class, / classrooms / cleaner. Exercise 6: Complete each sentence so it means the same as the sentence above. 1. My father bought this robot from Japan last week. → We have had 2. I won’t be able to do everything myself unless I have a modern robot. → If I don’t have 3. Minh likes teaching robots very much. → Minh is very interested in 4. The robot in my house can clean the floors very well. → The robot in my house is a very good 5. In the future, robots will be able to do all the dangerous things for people. → People won’t have to ______________________________________________________