21. History had also been described as a series of messes， but only by a historical

    analysis       how we get into the latest mess，and how we might get out of it.

    A. we have determined     B. we can determine

    C. can we determine       D. should we determine

    22. should any money be given to a small child.

    A. On no account     B. From all accounts

    C. Of no account     D. By all accounts

    23. Her answer is not acceptable， and        .

    A. so clever are the construction robots

    B. so clever the construction robots are

    C. such construction robots are clever

    D. such clever construction robots are

    24. We have done things we ought not to have done and undone things we ought to have done.

    A. leaving     B. will leave     C. left     D. leave

    25. no electric computers， there could have been no satellites or rockets.

    A. Had there been     B. If there were   C. Should there be    D. If there are

    26. into his office and stole his books， but they also tore up his manuscript.

    A. Not only they broke         B. They not only broke

    C. Not only did they break     D. They not only did break

    27. Only after many years of hard work  that money alone does not lead to happiness and success.

    A. did I realize     B. I did realize   C. had I realized   D. I had realized

    28. No sooner had ！ begun to enjoy my wealth         again reduced to my former state of poverty.

    A. than I was     B. than was I   C. when I was    D. when was I

    29. but I still like him.

    A. Selfish though he is    B. Selfish as he is

    C. Selfish he may be       D. Whether he is selfish or not

    30. So involved with their computers that leaders at summer computer camps often have to force them to break for sports and games.

    A. the children become     B. the children do become

    C. become the children     D. do the children become

    CAACA CAACD