He devoted all his life to ________ those who are suffering from cancer.
| A．helping | B．help |
| C．be helped | D．being helped |
It has been announced that candidates________remain in their seats until all the papers have been collected.
| A．can |
| B．will |
| C．may |
| D．shall |
—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 |