21、― It’s wonderful after the rain. The sky is clear and the air is so fresh.

― _______. Let’s go for a walk outside on this fine day.

       A. I mean                            B. You know                 C. You bet                    D. I think

20、―You ought to have given them some advice.

―_______, but who cared what I said?

       A．So I did                  B．So ought I               C．So I ought                     D．So did I

19、― I’m sure John will win the first prize in the final.

― I think so. He           for it for months.

       A．is preparing                                                B．was preparing         

C．had been preparing                                      D．has been preparing

18、Alice won’t want to eat it unless she is really hungry, _______ she’ll eat almost anything.

       A．for which               B．in which case          C．in that case             D．in which

17、― Have you got in touch with Mr. Smith, Peter?

― Yes．But ______ his phone number, I looked through the whole phone book.

      A．to find                    B．finding                    C．found                     D．find

16、― Anything wrong, officer?

― This is a 50-kilometer zone, but you _______ at 30 k/ph.

       A. were driving             B. are driving                C. had driven                D. have been driving

15、_______ in the traffic jam, I would have arrived there on time.

       A. Were not I caught                                                B. If I were not caught

       C. Had not I been caught                                          D. Had I not been caught

14、It’s widely believed that early rising _______ good health.

       A. turns to                    B. makes for                 C. takes up                   D. gets over

13、― How did you do in the test?

― Not so well. I _______ much better but I misread the directions for Part D．

       A．could do                B．must have done       C．could have done      D．should do

12、_______, he still couldn’t understand what I meant.

       A. However carefully I explained                        B. However I explained carefully

       C. However I careful explained                          D. However careful I explained.