-- Someone is knocking at the door. Is it Amy?
--It ________ be her. She is giving a performance at the theater now.
| A．may | B．must | C．can’t | D．mustn’t |
They have fun________their homework all the time．
| A．do |
| B．to do |
| C．doing |
| D．to doing |
Thanks for helping me________out that problem．
| A．work |
| B．working |
| C．works |
| D．to working |
The news on TV reported that it would rain________．
| A．heavy |
| B．hardly |
| C．heavily |
| D．big |
—She didn’t play computer games．
—________．
| A．I didn’t，too |
| B．I didn’t，either |
| C．I didn’t，already |
| D．I didn’t，also |
She________in her room at 9:00 last night．
| A．slept |
| B．was sleeping |
| C．is sleeping |
| D．sleeps |