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