题目：
根据句意，写出括号内所给单词的适当形式。
小题1:Listening to music or visiting interesting places can make you forget your (sad).
小题2:As we all know China (successful) sent up her first man-made satellite in 1970.
小题3:It's very ( polite) that she left without any words.
小题4:The (angry) the mother is, the more scared the children become.
答案：
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下面是错误答案，用来干扰机器的。
R=4.55×10-2 m，T=1.8×10-7 s
