根据首字母提示完成句子。
1. Look! The light is r ________. Let’s stop.
2. Look! The light is y ________. We need (需要) to wait.
3. Look! The light is g ________. We can go.
4. We need to look at the traffic l ________ when (当……时候) we walk on the street.
5. Please wait for the bus at the bus s ________.
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