假如你是李华，昨天你和同学们一起去郊外远足，你惊奇地发现田里树木被大量砍伐，河水变脏，很少看到鸟兽的踪迹。你希望人们爱护动植物，多植树，不要砍树。保持河水清洁，不要伤害鸟类、兽类，不要挖掘和采摘花草。为此，请你编写一封l00词左右的信，开头已给出。

Dear Editor，

Yesterday l went hiking for a field trip．I was very surprised to…

85．My TV set needs __________ (mend)．

84．Would you mind my__________ (open)the door?

83．This is a book __________ (write)by Lu Xun．

82．__________ (not know)his telephone number．I couldn’t ring him up．

81．Have you seen a wallet __________ (lie) on the ground?

80．Don’t you hear him __________ (sing)next door?

79．__________ (read)the instructions before you use the machine is necessary.

78．There are still some trees __________ (plant)

77．He offered __________ (help) us．