You’d better put a screen-safety on your computer _____ your eyes from _____.
| A．keep; damaged |
| B．stop; being damaged |
| C．to prevent; damaged |
| D．to protect; being damaged |
—Goodbye，John.Come back again sometime.
—Sure，________.
| A．I did | B．I do | C．I shall | D．I will |
It's the first time that he has been to Australia，________？
| A．isn't he | B．hasn't he | C．isn't it | D．hasn't it |
You and I could hardly work together，________？
| A．could you | B．couldnt' I |
| C．couldn't we | D．could we |
He must be helping the old man to water the flowers，________？
| A．is he | B．isn't he |
| C．must be | D．mustn't he |
I told them not everybody could run as fast as you did，________？(2011·重庆)
| A．could he | B．didn't I |
| C．didn't you | D．could they |