．Once it is formed，a bad habit is not easy to 。
| A．get rid of | B．pick Out | C．cut off | D．care for |
It’s based on the idea ______ all people are created equal, ______ is accepted by most people.
| A．that; which | B．which; which | C．which; when | D．that; that |
______ the ancient Egyptians built the pyramids puzzled people for centuries.
| A．Whether | B．What | C．How | D．Where |
______ I’m well again, I can go on with my work.
| A．Even if | B．As though | C．Ever after | D．Now that |
The government has to close those small factories to prevent the water of the river ______.
| A．polluting | B．from polluting | C．being polluted | D．polluted |
We should try our best to ______ those people after the disaster.
| A．break out | B．cheer on | C．break up | D．cheer up |