难度：★ 考点：单词拼写
根据下列句子的意思及所给单词的首字母或汉语提示，写出所缺单词，每空限填一词。
1. Though he has grown up，he isn't brave e________ to go out alone at night.
2. The living conditions in the countryside have ________ (改善)a lot.
3. The children didn't go to bed u________ their mother came back.
4. Now parents are ________ (花费）more and more money on their children's education.
5. Most people think bicycles are much safer than other v________ .
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