1 . ________ ________ (确保) that all the lights are turned off before you leave the lab. (根据汉语提示完成句子)
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2 . H______ (慢点, 别急)! I’ll tell you in a minute. (根据中英文提示填空)
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3 . __________ (当心) cars when you cross the road.
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4 . _________ (累加) your score and see how many points you get .
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