My father used to to work on foot, but now he is used to to work by bike.
| A．go; go | B．going; going | C．going; go | D．go; going |
_______ him and then try to copy what he does.
| A．Mind | B．Notice | C．See | D．Watch |
- I'm going to the post office.
-_______ you're there , can you get me some stamps?
| A．As | B．While | C．Because | D．lf |
- You seem familiar with Mr. John?
-Of course, we_______ together for three years in the 1990s.
| A．have worked | B．were working | C．are working | D．worked |
The new law says that people_______ drive after drinking wine.
| A．wouldn't | B．needn't | C．won't | D．mustn't |
You will fall behind others_______ you work hard.
| A．if | B．unless | C．though | D．since |