--- _________ I open the door, Mary?
--- ___________.
| A．May, Yes, you may. | B．May, No, you don’t.. |
| C．Can, No, you needn’t. | D．Can, Yes, you can’t. |
—Will there be more tall buildings in 50 years?—________.
| A．No，there isn't | B．No，they aren't |
| C．No，there won't | D．No，they won't |
—________will your father come back，Tony? —In three days.
| A．How long | B．How soon | C．How | D．How many |
I'm sure that there____more trees in our country in the future.
| A．have | B．are | C．will have | D．will be |
—Mike，you________play the piano well if you don't work hard.
—I know，Mom.
| A．don't | B．won't | C．doesn't | D．didn't |
You will________take a holiday after the exams.
| A．can | B．could | C．be able to | D．are able to |