When the man saw the car accident on the hightway ,he stoppe

When the man saw the car accident on the hightway ,he stopped （ ） offer help .
when the street light go on ( ) they make a beautiful picture ,so different from the daytime

to（不定式结构作目的状语）
When the street lights go on (at night) they make a beautiful picture,so different from the daytime.（提醒：与后面的daytime相对.）

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