You must ______ (当心汽车和自行车) when you cross the road.
正确答案及解析
正确答案
look out for cars and bikes
解析
句意：过马路的时候一定要小心汽车和自行车。情态动词 must 后加动词原形 look，look out for 意为当心，动词短语，汽车名词复数 cars，和 and，自行车名词复数 bikes，故答案为 look out for cars and bikes。
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