There was an excited expression ______ his face when he heard the good news．
| A．of | B．on |
| C．at | D．over |
My parents have __________ us $ 15，000 for the house. Shall we take it?
| A．provided | B．supplied | C．shown | D．offered |
The air company going from bad to worse, the workers __________ hardly enough to make a living.
| A．are paid | B．are paying | C．have paid | D．paid |
In some places women are expected to earn money __________ men work at home and raise their children.
| A．but | B．while | C．because | D．though |
They kept trying __________ they must have known it was hopeless.
| A．if | B．because | C．when | D．where |
The bad weather meant __________ the rocket launch(发射）for 48 hours.
| A．delaying | B．having delayed |
| C．to delay | D．to have delayed |