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21. If someone                        into the store, smile and say, “May I help you?”

      A. comes                     B. came                       C. will come                D. would come

22. If you ______all of my questions, I______ anything to help you.

      A. don’t answer / can’t do                              B. didn’t answer/ won’t do

      C. wouldn’t answer/ can’t do                         D. wouldn’t answer/ couldn’t do

29. If she asks for money, I                 her.

      A. will give                 B. gave                        C. would give             D. would have given

30. If I _______this exam, I’ll go to the university next summer.

      A. pass                        B. to pass                    C. had passed              D. passed