根据句意及首字母提示补全单词。
【小题1】Think it over before you make an important ddecision .
【小题2】Stupid is another way of saying ssilly .
【小题3】Our teachers taught us to sing llively songs before class.
【小题4】My parents often tell me not to speak to sstrangers
【小题5】Yesterday he ffailed in the exam, so his father hit him.
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解析：
【小题1】decision 此句意为：在作出重要决定之前，你要好好考虑。故此词为: decision.
【小题2】silly 此句意为：stupid是silly的另一种说法。故此空写为：silly.
【小题3】lively 此句意为：我们的老师在上课前教我们唱活泼轻快的歌曲。故此空写为：lively.
【小题4】strangers 此句意为：我父母经常叫我不要和陌生人讲话。故此空写为：strangers.
【小题5】failed 此句意为：昨天他考试不及格，所以他父亲打了他。此空应用一般过去时。故写为：failed.