Listen to the laughter, the girls _______themselves.
A. may enjoying B. can be enjoying
C. must have enjoyed D. must be enjoying
The weather turned out to be fine yesterday. You ________the trouble to carry your raincoat with you.
A．should have taken B．could have taken
C．needn’t have taken D．mustn’t have taken
Then you usually lie there just ______ the ceiling, thinking about everything that could go wrong.
A. glancing at B. watching at
C. glaring at D. staring at
---Do you mind my taking the books away?
---________.
A. Certainly, please do B. No, go ahead
C. Yes, not at all D. No, please don’t
—Who______ it be that is knocking at the door?
—It ______ be Father, but I’m not sure.
A. can; must B. can; may
C. must; can D. may; must
The reason for his success is ______ he worked very hard.
A. that B. why C. whether D. How
