—Jack can't concentrate on his lessons recently.
—Yes, that might ____ why he did so badly in the last test.
| A．answer for | B．apply for | C．call for | D．account for |
Joe, don't __________ now ； you're improving all the time. It won't be long __________ you can speak English well.
| A．give in ； until |
| B．give up ； before |
| C．give in ； when |
| D．give up ； after |
It was a nice meal,__________ a little expensive.
| A．though |
| B．whether |
| C．as |
| D．since |
He found it increasingly difficult to read，__________ his eyesight was beginning to fall.
| A．though |
| B．for |
| C．but |
| D．so |
I don't believe we've met before,__________ I must say you do look familiar.
| A．therefore |
| B．although |
| C．since |
| D．unless |
The old man asked Lucy to move to another chair __________ he wanted to sit next to his wife.
| A．although |
| B．unless |
| C．because |
| D．if |