---- I wonder how much you charge for your services．
---- The first two are free ____ the third costs $30．
| A．while | B．until | C．when | D．before |
—What do you think of the play?
—Oh, excellent! It’s worth a second time.
| A．seeing | B．to see |
| C．to be seen | D．being seen |
He is always helping people without expecting anything _____.
| A．in common | B．in turn |
| C．in danger | D．in return |
_____ is no doubt _____ Jennifer will come to see me this weekend as usual.
| A．It; that | B．It; whether |
| C．There; that | D．There; whether |
The last factory ______ I am going to visit is the place _____ my mother worked five years ago.
| A．which; where | B．that; where |
| C．where; where | D．that; which |
There are about 100 teachers, two thirds of______ are women.
| A．them | B．which | C．who | D．whom |