—How was that?
—I was chatting on line ______ the power went out.
| A．because | B．while | C．as | D．when |
Mind your ____, and thank your friend when you leave the party.
| A．advice | B．ways | C．manners | D．manner |
It might be dangerous, but that’s the chance you have to ____ , sir.
| A．make | B．take | C．fetch | D．hold |
I was about to get on the bus ____someone called me from behind.
| A．until | B．whether | C．while | D．when |
We won’t give up __________ we should fail 10 times.
| A．even if | B．since | C．whether | D．until |
Must I get through the business in one evening? No, you ________.
| A．mustn’t | B．haven’t | C．needn’t to | D．don’t have to |