74. This river is three thousand kilometers wide.

73. My son is sure his English exam.

72. She often dresses a red skirt.

71. Dig a hole large enough to the tree.

Can vegetables be planted in winter? Yes. But a greenhouse must　 　61　 built first. The greenhouse should be　 62 　　of glass. A large greenhouse may be 10 metres　 63 　, 3 metres　 　64　　 and 2.5 metres high. The sunshine can reach the vegetables　 65 　　the glass. The wind and the cold air can be　 66 　　from getting into it. The air　 67 　　the greenhouse is always warm. More and　 68 　　greenhouses are being built all over the world. All　 69　 　of vegetables can be brought on to our dinner table　　 70 　winter.

60.He didn’t leave anything and went out.(变为简单句)

He went out　　　　　　　 anything.

59. Can my bike be mended, Uncle Wang?(变主动语态)

　 　　　you　　　　 my bike， Uncle wang？

58.She got up very early so that she could catch the first bus.(变同义句)

She got up very early 　　　　　　　　the first bus.

57.Jim hasn’t seen the film and his friends haven’t，either.(合成一句)

Neither Jim’s friends 　　　　he 　　　seen the film.

56.We should turn down the radio while our baby is asleep.(变被动语态)

The radio should 　　　　　　down while our baby is asleep.