Tom，your room is too diay．You must________．
| A．clean up it |
| B．clean up them |
| C．clean them up |
| D．clean it up |
They arrived at the finishing line________the same time．We didn’t know who the winner was．
| A．on |
| B．in |
| C．at |
| D．for |
The boy started to play the guitar________the age of seven．
| A．for |
| B．in |
| C．at |
| D．to |
—I had a bad cold．
—________．
| A．That sounds great |
| B．Good idea |
| C．Thank you |
| D．I’m sorry to hear that |
—Will you have a picnic tomorrow?
—Yes．But if it________，we’ll visit the museum instead．
A．will rain
B．rains
C．doesn’t rain