---The air pollution is terrible.
---It will be worse _______ we take action to protect the environment.
| A． if | B．unless |
| C．until | D．When |
He won’t go to the birthday party if the host________ him.
| A．isn’t invited |
| B．doesn’t invite |
| C．won’t invite |
| D．won’t be invited |
— What do you think of Beijing?
— Wonderful. It ________ changed a lot in the last few years.
| A．have | B．has | C．is | D．was |
— You didn’t use to play tennis, ______?
— Yes. I still like playing tennis now.
| A．didn’t you |
| B．did you |
| C．weren’t you |
| D．were you |
---How long ____the supermarket ____? ---Four years.
| A．has, opened |
| B．has, been opened |
| C．did; open |
| D．has, been open |
There _____several football matches on TV this month.
| A．will be going to |
| B．will have |
| C．are going to be |
| D．is going to have |