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4. 他們可以在課堂上自由交談。

3. 但在美國，情況大不相同。

2. 在課堂上，他們總是仔細(xì)聽講，認(rèn)真做筆記。

1. 中美課堂有些不同。

5. You must be careful with your things.

      with your things.

4. Will you please read it again?  

       again,please.

3. You can't go to bed late.

      to bed late.

2. You shouldn't play football on the street. It's dangerous.

       on the street. It's dangerous.

1. If you don't listen carefully,you will hear noth?ing.

       carefully,you will hear nothing.

(   ) 8. —What are the rules at your school?

―Don't run in the hallways and       arrive late for class.

   A. not to   B. won't

   C. don't   D. no