71.You’d better ______ ______ ______ and ______ _____ to keep fit.要保持体形你最好多吃蔬菜少吃肉

72我认为多朗读是学外语的一种好方法.

　I think doing more reading is ____ ____ ____ to learn a for

70. ______ ______(关掉)the lights before you leave the room.

69. Vegetables and fruit are _____ _____ (对　 有利)your health.

68. I think the problem must be ______ _______.(严肃对待)

67. The web is ______ ____ ____(由　 组成) many documents called web pages.

66.You’re not ______ _____ (被允许)go into the park without a ticket.

65. Aren’t you ______ ______ (为什么担心)the dangers of such long fights on the envrionment?

64. Does it ______ _____ _____ (对　 有害)the environment.

63. Recycle means “______ things ______ (把　 变成)something else.”

62. 即使最简单的日常行为都会对环境产生真正的影响。

Even the simplest everyday activities ______ ______ _______ _______ ______ the environment.