---What are these bottles ?
---Drinking water.
| A．used by | B．used to |
| C．used for | D．used up |
Could you tell me ?
| A．when does the train leave | B．there’s a bank near here |
| C．where can I park | D．what your mother is |
The first thing I’m going to do is to send an e-mail to Peter.
| A．which | B．who | C．that | D．why |
—The air pollution is so terrible.
--It will be worse we do something to protect the environment.
| A．if | B．unless | C．after | D．when |
We should do what we can our English.
| A．improve | B．improved |
| C．to improve | D．improving |
–Whose dictionary is this?
-- It be Jack’s. Here’s his name.
| A．must | B．mustn’t | C．can | D．can’t |