I____ asleep because it took me a long time to realize that the telephone was ringing.
| A．could have fallen | B．should have fallen |
| C．must have fallen | D．mustn’t have fallen |
Of the three questions the first one is the ___ difficult .
| A．least | B．much | C．more | D．less |
The work became ___.
| A．so harder | B．much hard | C．harder and harder | D．as hard |
She sings __ than any other girl in her class.
| A．a lot better | B．a lot more better | C．more a lot better | D．a lot well |
The Yello River is long, but the Yandtze River is __.
| A．even longer | B．long | C．much long | D．so longer |
It was raining ___ when I woke up last night.
| A．heavy | B．heavily | C．heavier | D．heavily |