In a sports team each player has a clear role，and there are few occasions members are confused or uncertain of their roles．
| A．which | B．that | C．when | D．how |
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 |
I'm sorry you've been waiting so long, but it'll still be some time __________ Brian gets back.
| A．before |
| B．since |
| C．till |
| D．after |