I have to be off now．My friends________outside．
| A．wait |
| B．are waiting |
| C．have waited |
| D．were waiting |
— Must I come at four o’clock?
— Oh, no, you ________.
| A．don’t |
| B．mustn’t |
| C．don’t have to |
| D．can’t |
It’s too cold. You had better ______ your coat.
| A．don’t take off |
| B．not take off |
| C．don’t put on |
| D．not put on |
-Would you mind _______ the window?
-Of course not. I feel hot, too.
| A．not open |
| B．not opening |
| C．opening |
| D．to open |
There _______ a football match next week.
| A．will have |
| B．is going to be |
| C．have |
| D．is going to have |
This article says________ is bad for our lungs.
| A．smoke | B．to smoke |
| C．smoked | D．smoking |