He said he would return the money, and I was ______.
| A．fool enough to believe him |
| B．enough fool to believe him |
| C．fool enough believing him |
| D．enough fool believing him |
The door __________ open, no matter how hard she pushed.
| A．shouldn't |
| B．couldn't |
| C．wouldn't |
| D．mightn't |
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 |
-You needn't take an umbrella. It isn't going to rain.
-Well, I don't know. It __________ do.
| A．might |
| B．need |
| C．would |
| D．should |
It __________ be the vocabulary that caused you the problem in the exercise because you know a lot of words.
| A．may |
| B．couldn't |
| C．should |
| D．needn't |
No one __________ be more generous; he has a heart of gold.
| A．could |
| B．must |
| C．dare |
| D．need |