—— Bob looks very blue. What has happened to him?
—— Perhaps his failure in the exam _____ his low spirits.
A accounts for B looks for C makes for D takes for
We came home after our holiday only __________ our pet dog injured.
| A．found | B．to be found | C．find | D．to find |
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 |