观察下面的图片，判断以下句子正误，正确的写T，不正确的写F。
1．The picture is about the traffic lights.
________2．We must pay attention to the traffic lights.
________3．When it's red, the car can go straight, but the people who are walking should stop.
________4．When it's yellow, everyone must stop.
________5．The people who are walking can't go on the street.
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