The computer system ____ suddenly while he was searching for information on the Internet.
| A．broke out | B．broke down | C．broke up | D．broke in |
It is quite often that the workers are always ________ by heat if they work outdoors for a long time in the hot summer afternoon.
| A．astonished | B．depressed |
| C．overcome | D．hit |
Britain is being ________ in the race for new markets.
| A．left alone | B．left out |
| C．left behind | D．left over |
This ship set sail and gradually disappeared where the sea ________ the sky.
| A．meets | B．reflects |
| C．catches | D．connects |
We are glad to ________ you on the progress you have made.
| A．congratulate | B．celebrate |
| C．greet | D．appreciate |
Since you are always working hard at your lessons, your efforts will ________.
| A．pay off | B．pay for |
| C．pay back | D．pay out |