问题描述：
You must stop if the traffic light＿＿＿（be）red. Don
You must stop if the traffic light＿＿＿（be）red.
Don't go out if you＿＿＿＿（not finish）you homework.
You must stop if the traffic light＿＿＿（be）red.
Don't go out if you＿＿＿＿（not finish）you homework.
问题解答：
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