He _____ have completed his work; otherwise, he wouldn’t be enjoying himself by the seaside.

A. should        B. must         C. wouldn’t         D. can’t

 “Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.” 高.考.资.源.

    A. must; could        B. may; might

    C. need; must         D. could; need

 “I thought you wouldn’t mind.” “Well, as a matter of fact I don’t, but you _____ me first.”

    A. should ask             B. should have asked

    C. must ask               D. must have asked

Even though I’d hurt my leg, I______swim back to the river bank.

  A. could             B. might               C. had to                D. was able to

—Could I call you  by your first name?   —Yes, you______

A.will               B.could            C.may             D.might

It’s good that we _____ to the park because it’s started to rain.

    A. don’t go           B. hadn’t gone    C. didn’t go          D. wasn’t going

—Did you find the missing couple in the mountain yesterday?

   —No, but we ________ to get in touch with them ever since.

   A．have tried　　　　　　　　　　 B. have been trying

   C．had tried　　　　　　　　　　　 D. had been trying

—We     to put off our school sports meet until next month.

 —I     that.

A. have decided; didn’t expect                 B. decided; didn’t expect

C. have decided; haven’t expected              D. decide; don’t expect

—I wonder how long you _____ in Hawaii.

—Just for the weekend, then I had to attend a conference in Los Angeles.

A.will stay      B.were staying       C.have stayed             D.stayed

—Why didn’t you buy the calculator?

—I ______, but Mother ______ allow me.

A. would want to; didn’t      B. had wanted to; didn’t

C. wanted to; wouldn’t       D. had wanted to; wouldn’t