IV. 本题共有10个小题，请在四个选项中选出最佳答案。

21. We are planning ________11-day trip to Century Park. ______trip must be fun.

22. Traveling abroad is becoming popular though it still _______too much.

23. Don’t you think we have to _______ our hobbies because of the busy school work?

 A.put up         B.set up            C.g ive up          D.look up

24. Bicycling is good exercise, ______, it does not pollute the air.

 A.however        B.besides          C.but             D.except

25. Lei Fen is really an example for us all. Let’s keep it the legend _______.

A.live            B.alive            C.lively           D.a life

26. --Can you understand it?

--Of course I can. Our teacher ______it many times.

A.taught       B.has been taught    C.has taught       D.is taught

27. Sara _______a book from the library last week she’s ______it almost a week.

 A.borrowed, had                  B.bought, kept 

C.borrowed, borrowing             D.borrowed,kept