题目内容
7．Everyone should try to be polite andhelpful to others．（help）分析 每个人都应该尽力做一个对别人有礼貌，乐于助人的人．
解答 答案：helpful，根据句意，做有礼貌，乐于助人的人，help动词"帮助"，应用形容词形式helpful"乐于助人的"．
点评 考查同一个单词的不同词性的变化及用法，根据句子意思选择单词的合适的形式．
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