用方框中的词把对话补充完整，每个单词只能用一次。

red     cross    mustn't    lines    must     with

(J=Jim, M=Mum)

M: I'm going shopping, Jim.

J:  May I go you?

M: Yes, but you run in the street.

J: OK.

M: Look at the light. We mustn't cross the street now.

J: OK.

M: Now the light is green. We can the street.

J: Yes.

M: Look at these white. We must cross the street here.

J: Oh, I see.