21. Generally, the thicker a mammal's (哺乳动物) skin is, the less hair ______.

A. that has it B. that it has C. has it D. it has

22. My father ______ an invitation to a dinner party, but he _______ it.

A. accepted…received B. received…accepted

C. accepted…didn't receive D. received…didn't accept

23. _______ their homework, the children went for a walk.

A. When they were doing B. After they have done

C. Having done D. They had done

24. My parents never let me _______ alone.

A. to travel B. to travelling C. travelling D. travel

25. Hardly _______ the classroom when the class began.

A. had he entered B. he had entered C. he entered D. he was entered

26. We all enjoy working _______ him because he is a kind leader.

A. along B. in C. under D. on

27. She is _______to refuse, so I have to give in.

A. a too kind girl B. too a kind girl

C. too kind a girl D. a gird kind too

28. He couldn't use his own car because it ________ then.

A. was being repaired B. was repairing

C. is repairing D. has been repaired

29. _______ go to the Great Wall for a visit?

A. Why don't B. How about C. Will we D. Why not

30. With the guide ______ the way, we set out on foot into the night dark.

A. lead B. leading C. led D. to lead

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