________ more careful, his ship would not have sunk.
| A．If the captain were | B．Had the captain been |
| C．Should the captain be | D．If the captain would have been |
It’s still early, you _____.
| A．mustn’t hurry | B．wouldn’t hurry | C．may not hurry | D．don’t have to hurry |
The plant is dead. I _____ it more water.
| A．will give | B．would have given | C．must give | D．should have giv |
There was plenty of times. She _____.
| A．mustn’t have hurried | B．couldn’t have hurried |
| C．must not hurry | D．needn’t have hurried |
16. You _____ return the book now. You can keep it till next week if you like.
| A．can’t | B．mustn’t | C．needn’t | D．may not |
I thought you _____ like something to read, so I have brought you some books.
| A．may | B．might | C．could | D．must |