The old couple often take a walk after supper in the park with their pet dog _____them.
| A．to follow |
| B．following |
| C．followed |
| D．follows |
— Tom is never late for work. Why is he absent today ?
— Something _______ to him.
| A．must happen | B．should have happened |
| C．could have happened | D．must have happened |
— Shall I give you a ride as you live so far away ?
— Thank you. _______.
| A．It couldn’t be better | B．Of course you can |
| C．If you like | D．It’s up to you |
If I ________ plan to do anything I wanted to. I’d like to go to Tibet and travel through as much of it as possible.
| A．would | B．could | C．had to | D．ought to |
— Do you know where David is ? I couldn’t find him anywhere.
— Well. He ______ have gone far –his coat’s still here.
| A．shouldn’t | B．mustn’t | C．can’t | D．wouldn’t |
— Lucy doesn’t mind lending you her dictionary.
— She _______. I’ve already borrowed one.
| A．can’t | B．mustn’t | C．needn’t | D．shouldn’t |