Don’t bother Tom, he is ______ with the experiment on water molecules in the lab.
| A．focused | B．fixed | C．occupied | D．concentrated |
Start out right away，__________ you'll miss the first train.
| A．and | B．but | C．or | D．while |
Not only __________ polluted but crowded.
| A．was the city ； were the streets |
| B．the city was；were the streets |
| C．was the city ； the streets were |
| D．the city was ； the streets were |
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 |