________ books aren’t old. ________ are new.
| A．Their, They | B．Their, Their |
| C．They’re, They’re | D．They, They |
Please________hot water into the blender.
| A．cut | B．mix | C．pour | D．carry |
—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 |