Be(care)_____ while crossing the roads and remember that they drive on the left in England.

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问题 Be(care)_____ while crossing the roads and remember that they drive on the left in England.

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答案careful

解析 空格前的Be是动词原形,空格后的while crossing the roads表时间,因此要填入分词或形容词。故需把care改成形容词careful“小心的”。
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