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 |
I got up early this morning, but I ________ so because I was not on duty today.
| A．mustn’t have done | B．needn’t have done |
| C．didn’t need to do | D．can’t have done |
It’s dangerous to have the fire _______ at home all night long.
| A．to burn | B．burn | C．burned | D．burning |
—Are you satisfied with this hotel ?
—Not a little. We can’t have _________ .
| A．a nicer one | B．a worse one | C．such a bad one | D．so nice one |
We______ the old scientist _____his contribution ______the country.
| A．admire; for; to | B．admire; at; to | C．respect; on; for | D．respect; on; at |
.We are living in an age ______ many things are done on computers.
| A．which | B．when | C．that | D．where |