21. It‘s time___about the pollution problem in the city.

    A. everything is done

    B. anything will be done

    C. nothing to be done

    D. something was done

    22. Bob tried in vain to talk his little brother ___some money from their mother‘s purse.

    A. to steal

    B. to stealing

    C. into stealing

    D. into steal

    23. When I saw Jane， I stopped and smiled， but she___me and walked away.

    A. refused

    B. ignored

    C. denied

    D. missed

    24. Little___the danger he is in.

    A. he realizes

    B. he has realized

    C. does he realize

    D. he does realize

    25. The book lists the phenomena and explains the reason___.

    A. as well

    B. only

    C. excessively

    D. as well as

    26. Parents love their children with a devotion ___ no return.

    A. which they ask for

    B. for which they ask

    C. for which they ask for

    D. which they ask

    27. If you had come here yesterday， you ___him.

    A. would see

    B. would have seen

    C. saw

    D. had seen

    28. ___alone， I turned on the radio for company.

    A. Be

    B. Been

    C. Being

    D. Having been

    29. I don‘t expect you ___the exam again.

    A. fail

    B. to fail

    C. failing

    D. to be failed

    30. It___ him only half an hour to finish his homework， and he ___ most of the evening watching TV.

    A. cost， paid

    B. took， used

    C. took， spent

    D. used， spent