21. She said she would go and she _________ go.

　　A. didn’t B. did C. really D. would

　　【答案】 B。解析：在谓语动词前加do表示对动作的强调。and连接两个并列谓语，其形式应一致，故用过去时态。

　　22. He can’t be her father, _________ he?

　　A. is B. isn’t C. can D. can’t

　　【答案】A。解析：can 的反义疑问句分两种：表能力时，前面肯定则后面用否定，can’t ;前面否定则后面用肯定can;表猜测时，前面是肯定后面用 be 动词否定形式或者助动词否定形式 + 主语。反之亦然。如 It can be right, isn’t it? It can happen soon, doesn’t it?本题表示推测，前面是否定，故后面用is，选A。

　　23. —____ delicious food you served us tonight! Thank you very much.

　　—I’m glad that you enjoyed it.

　　A. How B. How a C. What D. What a

　　【答案】C。本题考查感叹句，中心词是food名词且不可数，故选C。what +形容词+不可数名词或可数名词复数+主语+谓语!

　　24. Every evening Mr. King takes a _______ to his home.

　　A. 25 minutes’ walk B. 25 minute’s walk

　　C. 25 minute walk D. 25 minutes walk

　　【答案】A。解析：本题考查的是复数名词的所有格。Minute为可数名词，其复数为 minutes，该复数的所有格为直接加’即可。因此A为正确答案。

　　25. Although I failed four times, my father encouraged me to have a ________ try.

　　A.second B.third C.fourth D.fifth

　　【答案】C。解析：根据前面的four times可知要试第五次。句意是“虽然我失败了四次，但我的爸爸鼓励我尝试第五次。