If we ________   a table earlier, we wouldn't be standing here in a queue.

A. have booked          B. booked

C. book                  D. had booked

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

I ________ myself more—it was a perfect day.

A. shouldn’t have enjoyed           B. needn’t have enjoyed

C. wouldn’t have enjoyed            D. couldn’t have enjoyed

They were abroad during the months when we were carrying out the investigation, or they _____ toour help.

A. would have come         B. could come

C. have come               D. had come

People are recycling many things which they away in the past.

A. had thrown             B. will be throwing

C. were throwing          D. would have thrown