57. 汽车是由许多不同的部分组成的。

A car                            many different parts.

56. 不要浪费一滴水。

Don’t waste                           .

54 John’s garden becomes        ( beauty) with the help of Lucy.

55. It’s hot today .Let’s       ( go) swimming.

52. When I came into my room,I heard someone        (sing) next to my room.

53. Tom has to        ( finish) his homework first and then goes to play with others.

50. We have enough rooms        ( live ) in. Don’t worry about that.

51. We need        (water) the flowers twice a week.

48. It is not easy        (learn) a foreign language well.

49. The water here is safe        (drink) .

46. My father always tells jokes to make us        (laugh) .

47. Our teacher often tells us        ( help) the poor.

44. Most people put their money in the b  , because they think money is safe there.

45. —I’ll give you 100 yuan for the shoes.Keep the c  .

  —Thanks a lot.

42. Please speak in a loud v  ，or I can’t hear you.

43. Time is very v  ，so we should use it well.

40. We need a longer       (管道) .Let me buy it on the Internet.

41. F  water is important in this place.