25.Ii is rather difficult to make friends with him, but his friendship,_______, is more true than any other’s

A once gained　 B. when to gain　 C. after gaining　 D. while gaining

24.Many of the creatures in Rowling’s world are not real, and much of _______ happens is strange

A .which　　　　　　 B. that 　　　　　　　C. what　　　　　　　 D. it

23._____ Shall we have a smoke here?

　 ______ No, we ______ because the worker is carrying some petrol.

A won’t　　　　 B mustn’t　　 C can’t　　 D needn’t

22.____ Look ! What a terrible mistakes! Why?

　 _____Sorry, I ______ on lt.

A. don’t concentrate　　 　　　　　B. hadn’t concentrated

C. hadn’t been concentrating　　　　 D. wasn’t concentrating

21.The task is too much for me, so I cannot carry on _____any longer. I must get some help.

　A singly　　　　　　　 B. simply　　　　　　 C. alone　　　　 D lonely

5. BIt is no wonder that句型，句意为：难怪他今天看起来如此高兴。 6.C本句用it指代上文提到的another novel，用情态动词should/ought to表示推测与判断，“理应，应该”。 7． C。 8. A考查代词的用法。根据语境，第一空用it指代前面提到的“只有一个MP3播放器”，第二空用one表示“到其他商店找一个”。

4.A 考查代词。用"one”来代替不特指的单数名词“a house”。“ones”代替的是复数名词。

3.B.代词。it指下文中要提到的事物。类似的还有: I hate it when he speaks with his mouth of food./ Like it when…/depend on it that…等.这个句子显然不能理解为宾语从句,if 引导的是状语从句,it 是代词做appreciate 的宾语。

2.Dit作形式宾语,替代后边的动词不定式。

1.B 这是一个of提前的非限制性的定语从句，which指代前文的three books。