30. Every day, the old man would go to the park and sit in his    chair to have a rest.

  A. usual          B. common      C. general         D. ordinary

29. From the word ________ on the old pot, we decide that it dates back to at least five hundred years ago.

  A. having been marked B. marked C. to be marked D. being marked

28.       you talk to someone or write a message, you show your skills to others.

  A. At times B. Some time  C. Every time D. The time

27.          , the mountain climbers eventually conquered Mountain Qomolangma.

  A. As the difficulty was great        B. Great as the difficulty was

  C. A great difficulty as it was        D. The difficulty was great

26. But for Jim's materials from the Internet, our group     the written report of the exploring course in advance.

  A. shouldn't have carried out        B. hadn't carried out

  C. won't carry out                 D. couldn't have carried out

25. They told about lots of differences between children's lives in cities and     in villages.

  A. one            B. that          C. those            D. them

24. -- As you know,          man can't live without          water.

  A.不填；不填          B. a; the        C. a;不填         D.不填; the

23. Mr Smith became a teacher in 1989. He       for twenty years by next summer.

  A. will teach                      B. would have taught

  C. has been teaching               D. will have been teaching

22. We came to a place           they had never paid a visit before.

  A. which           B. that        C. to which         D. at which

21. -- Better get down to your homework, Tim.

     --____________.

  A. You're welcome                 B. Mind your own business

  C. Not to mention it                D. It's my pleasure