- Air quality in our city is becoming worse and worse.
- Yes. These days' PM2.5 readings are frightening. We must do something to _______ air pollution.
| A．reduce | B．remove | C．collect | D．gather |
---Who cleaned the blackboard yesterday, Dick?
---John _________.
| A．cleaned | B．does | C．did | D．is |
A talk on Chinese history ________ in the school next week.
| A．be given | B．has been given |
| C．will be given | D．will give |
I _____ 900 English words by the time I was ten。
| A．learned | B．was learning |
| C．had learned | D．learnt |
--Let's go fishing if it _______ this weekend.
--But nobody knows if it_______.
| A．is fine, will rain | B．will be fine, rains |
| C．is fine, rains | D．will be fine, will rain |
The room ___ cool in summer and'warm in winter.
| A．feels | B．is felt | C．feels to be | D．is felt to be |