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21. ??_____ do you communicate with your friends far away?

   ?? By sending e-mails.

    A. How        B. What       C. Why             D. When

22. We should try to avoid ______ the things that we don??t need.

    A. buy       B. buying      C. to buy        D. to buying

23. He asked me_________ we could go to Beijing to watch the game by plane.

   A. that               B. if                      C. how                     D. what

24. Jenny is on holiday now. I wonder ________.

  A. when she will come back        B. when she comes back                     

  C. when will she come back      D. when does she come back

25. My sister isn??t ___________to look after herself.

  A. young enough   B. enough young   C. old enough    D. enough old

26. ??Is the man over there Mr. Brown?

   ??It ______be him. He has gone to Brazil to watch the World Cup.

   A. may not              B. can??t          C. shouldn??t          D. mustn??t

27. I am weak in math, so I think I should practice as much as I can ______ my math.

   A. improved        B. to improve         C. improving        D. improve