He stepped into the office, _____down and began to fill in the forms.
| A．sitting | B．to sit |
| C．sat | D．having it |
We often talk in groups and share our ideas with _____.
| A．other | B．others | C．another | D．the other |
Many people think that English is _____ of all the subjects.
| A．important | B．more important |
| C．most important | D．the most important |
She asked us _____ the dialogue and try to recite it.
| A．read | B．reads | C．to read | D．reading |
Look! It ____ hard now. You’d better wait for a while until it stops.
| A．rains | B．has rained |
| C．will rain | D．is raining |
You ____ swim in the river here. It’s dangerous.
| A．can’t | B．may not |
| C．mustn’t | D．needn’t |