I should not have laughed if I ________ you were serious.
A.thought B.would think
C.had thought D.have thought
He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.
A. wouldn't B. shouldn't
C. couldn't D. mustn't
When I was a child, I ________ watch TV whenever I wanted to.
A. should B. could
C. must D. need
Since nobody gave him any help, he ________ have done the research on his own.
A. can B. must
C. would D. need
—What are you doing this Saturday?
—I'm not sure, but I ________ go to the Rolling Stones concert.
A.must B.would
C.should D.might
—It rained cats and dogs this morning.I'm glad we took an umbrella.
—Yeah, we would have got wet all over if we ________.
A.hadn't B.haven't
C.didn't D.don't
