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Có thể viết được bảo nhiêu số có 3 chữ số khác nhau biết rằng: a) các chữ số của nó đều là những số lẻ? b) các chữ số của nó đều là những số chẵn?
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31. ________more information, please telephone our main office. A. If you will need B. Should you need C. You should need D. If you needed 32. If Jack refuses to help, we manage without him. A. have to B. will have to C. had to D. are having to 33. I cannot buy a new computer_______ I save enough money. A. if B. even if C. unless D. as if 34. You will get a good seat if you _____ first. A. come B. came C. have come D. will come 35. We’ll be late unless we ____ now. A. leave B. don’t leave C. had left D. have left 36. We can reuse _______ . A. water B. air C. noise D. bottles 37. What does “reduce” mean? A. using something again B. using something more C. using something less D. collect something 38. What does “reuse” mean? A. using something again B. using something more C. using something less D. collect something 39. We shouldn’t _____ rubbish on the street. A. throw B. reuse C. wrap D. turn off 40. Polluted water can make fish _____. A. live B. sleep C. grow D. die 41. Soil pollution can lead to lack __________ food. A. for B. in C. on D. of 42. Almost 27,000 trees are cut __________ every day just to make toilet paper! A. off B. down C. up D. in 43. The three Rs __________ reduce, reuse and recycle. A. mean by B. turn to C. stand for D. put up 44 You shouldn’t throw those papers away; they’re __________ A. refillable B. reducible C. recyclable D. repayable 45. We should use reusable shopping bags __________ plastic bags. A. instead of B. because of C.in spite of D. place of

16. These three Rs _________ reduce, reuse and recycle. A. stand up B. stand for C. ask for D. means 17. If there is a rubbish bin in every class, the classroom will become ______. A. harmful B. lighter C. dirtier D. cleaner 18. “Don’t throw rubbish into the river because you will make it _________” A. greener B. dirty C. cleaner D. fresher 19. If we use ________ paper, we will save a lot of trees. A. fewer B. less C. more D. much 20. I __________ you if you need my help. A. am helping B. could help C. will help D. helped 21. If someone into the store, smile and say, “May I help you?” A. comes B. came C. will come D. would come 22. If you ______all of my questions, I______ anything to help you. A. don’t answer / can’t do B. didn’t answer/ won’t do C. wouldn’t answer/ can’t do D. wouldn’t answer/ couldn’t do 23. “Here’s my phone number.” - “Thanks, I_____ you a call if I _____some help.” A. will give / will need B. would give/ needed C. give/need D. will give/ need 24. The teacher was absent today, so the class was canceled. If she_____ absent again tomorrow, class _____tomorrow, too. A. is / will cancel B. is/ will be canceled C. was / would be canceled D. was/ would cancel 25. I won’t lend you this money you promise to pay it back. A. in case B. if C. otherwise D. unless 26. _____there are some more ideas, we can end the meeting now. A. Unless B. If C. As if D. In case 27. “It’s really raining.”“Yes. If the weather______, we’ll have to camp somewhere else. A. would get worse B. might get worse C. gets worse D. should get worse 28. If anyone _______him I ______ back at 9 o’clock. A. calls / tell / will be B. called / telling / would be C. is calling / tells / am D. will call / to tell / am 29. If she asks for money, I her. A. will give B. gave C. would give D. would have given 30. If I _______this exam, I’ll go to the university next summer. A. pass B. to pass C. had passed D. passed

MULTIPLE CHOICE I. Choose the best answer to complete each of the following sentences. 1. If people ______ public transport, there will be less pollution. A. use B. will use C. can use D. used 2. ______we miss the last bus, we will have to walk home. A. As B. When C. If D. Unless 3. People have ________this beach with a lot of trash. A. spoiled B. cleaned C. collected D. protected 4. He got a ________ for packing on double yellow lines. A. fee B. ticket C. fine D. token 5. By sticking labels over the address you can _______. envelopes. A. recycle B. reduce C. reuse D. return 6. Because plastic bags are very hard to ________, they will cause pollution. A. dissolve B. wrap C. tear D. collect 7. These materials can be _____ into other packaging products. A. reused B. reduced C. removed D. recycled 8. If we _______waste paper, we will save a lot of trees. A. repeat B. recycle C. rewrite D. remake 9. If we plant more trees in the schoolyard, the school will become a_____ place. A. greener B. darker C. dirtier D. more polluted 10. “Why do you often forget to_______ the lights when you go out of the classroom?” A. reduce B. turn off C. close D. shut down 11. “What can we do ____ air pollution?” A. reduce B. to reduce C. reducing D. to reducing 12. You can save money while shopping by only buying _______ you need. A. what B. a C. this D. that 13. Please collect all recyclable materials, and take them to the ______. factory. A. recycle B. recycled C. recyclable D. recycling 14. This newspaper is made of _______paper. A. recycle B. recycled C. old D. waste 15. If we all use _______ bags, we’ll help the environment. A. new B. cheap C. reusable D. reduced

XXII. Rearrange the words to make sentences. 1. Alice/ like /sports /much/ doing/ very/ doesn’t. ……………………………………………………………………………………… 2. the / the/ No / Nile. / longer/ is/ river / than / in / world ……………………………………………………………………………………… 3. practise/ do / table tennis / ? / you / How / playing/ often .................................................................................................................................... 4. university. / go / not/ to / might/ He ……………………………………………………………………………………… 5. this/ programme / like / boring. /so / because / I/ it’s/ don’t ....................................................................................................................................

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