everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as possible．
| A．Because | B．Since | C．While | D．If |
Dark glasses are sometimes worn to ________ the eyes from strong sunlight.
| A．prevent | B．care |
| C．defend | D．protect |
Although different in many ways，the British and the Americans ________ many of the same customs.
| A．make | B．take |
| C．share | D．give |
The little chick the ________ earthworm，deciding whether to swallow it or let it go.
| A．glimpsed at | B．looked into |
| C．stared at | D．glared at |
There are some spelling mistakes in your composition，but ________ your composition is good.
| A．as a whole | B．on the whole |
| C．on one hand | D．on the other hand |
Though this question is very difficult，if you ________ trying you will find the right answer.
| A．keep up | B．keep on |
| C．keep out | D．keep off |