问题描述：
1.We shouldn't l______ at those who are in trouble. 2.T_____ they are poor,they are happy.
3.Liu Mei has no i_______ in math at all
4.It's necessary ______(have) a few friends in our life.
5.He doesn't know how _____(use) the camputer.
3.Liu Mei has no i_______ in math at all
4.It's necessary ______(have) a few friends in our life.
5.He doesn't know how _____(use) the camputer.
问题解答：
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