— Would you allow me ________ here?
— Sorry. We don’t permit _________ in the lab.
A. smoking; smoking B. to smoke; to smoke C. smoking; to smoke D. to smoke; smoking
— Do you know where David is? I couldn’t find him anywhere.
— Well. He ________ have gone far — his coat is still here.
A. shouldn’t B. mustn’t C. can’t D. wouldn’t
Sara hopes to become a friend of _________ shares her interests.
A. anyone B. no matter who C. whoever D. whomever
He has some doubt ________ he will succeed in his research work.
A. whether B. weather C. which D. that
_________ is known to all, the moon travels round the earth once every month.
A. It B. As C. That D. What
Sorry, I am late. I ______ have turn off the alarm clock and gone back to sleep again.
A.might B. should C. need D. would
