—Can you keep the secret?
—You ________ worry — I'm not going to mention it to anyone.
| A．needn't | B．couldn't |
| C．mustn't | D．won't |
—Catherine. I have cleaned the room for you.
—Thanks. You________it. I could manage it myself.
| A．needn't do |
| B．needn't have done |
| C．mustn't do |
| D．shouldn't have done |
—I don't mind telling you what I know.
—You________. I'm not asking you for it.
| A．mustn't |
| B．may not |
| C．can't |
| D．needn't |
This cake is very sweet. You________a lot of sugar in it.
| A．should put |
| B．could have put |
| C．might put |
| D．must have put |
—Lucy doesn't mind lending you her dictionary.
—She________. I have borrowed one.
| A．can't |
| B．mustn't |
| C．needn't |
| D．shouldn't |
He________have completed his work; otherwise, he wouldn't be enjoying himself by the seaside.
| A．should |
| B．must |
| C．wouldn't |
| D．can't |