题目内容
18．-Be sure tolock（锁上） your bicycle．--OK，I will．
分析 --一定要锁上你的自行车．
--好的，我会的．
解答 答案：lock
根据应填词语后的名词"your bicycle"和提示词可知，这里为考查动词"lock"．此句还涉及到一个短语be sure to do sth 确定做…；所以这里应该用lock的原形，答案为lock
点评 做这道题时应先根据现有句子判断所填词语的词性，然后写出所填词的适当形式． 应注意的是这句话涉及到短语be sure to do sth
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