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30. It is the greatest happiness on earth ______.

　　 A. loving and to be loved　　　　　　　　　　 B. to love and being loved

　　 C. to love and to be loved　　　　　　　　　 　D. love and be loved

29. To play fair is as important as ______.

　　 A. to play well　　　　 B. play well　　　　　 C. we play well　　　　 D. playing well

28. ---- Go to the theatre with me, will you?　　　　　　　 ---- I should like ______, but I don't have time.

　　 A. to　　　　　　　　 B. too　　　　　　　 C. to do　　　　　　　 D. to go to

27. I don't know her and I don't ______ .

　　 A. want　　　　　　　 B. want to　　　　　 C. want it　　　　　　 D. to want

26. Now we could not do anything but ______ for him here.

　　 A. waited　　　　　　 B. waiting　　　　　　 C. to wait　　　　　　 D. wait

25. Paul does nothing but _____ all day long.

　　 A. play　　　　　　 B. to play　　　　　　 C. playing　　　　　　 D. played

24. I saw Mary ____ the house.

　　 A. open the door and go into　　　　　　　　 B. to open the door and to go into

　　 C. open the door and to go into　　　　　　　 D. open the door and went into

23. Mr. White was seen ______ the Palace Museum.

　　 A. enter　　　　　　　 B. to enter　　　　　　 C. entered　　　　　　 D. to entering

22. I was surprised______.

　　 A. watching him to eat so quickly　　　　　　 B. watch him eat so quickly

　　 C. watching him eat so quickly　　　　　　　 D. to watch him eat so quickly

21. I know him ______ a good football player while in college.

　　 A. to have been　　　 B. to be　　　　　　 C. was　　　　　　　 D. had been