Supporters of underground development say that building down ____ building up is a good way to use the earth’s space[ ]

Who’s _________ in China, Yao Ming or Liu Xiang

The English in the future will be quite different from the English of today. It is possible that some English words may ____ even completely.[ ]

The fact that people are afraid to go out at night is often a result of perceived (感知) danger ________actual danger[ ]

Why do you admire Mr. Hu so much— Because he is the person ______ helps us learn much knowledge.