Предложения с глаголом must

1) You must listen to me very attentively if you want to understand this topic.

2) You mustnt throw any trash on the streets, it may cause a pollution.

3) I must finish working on this article!

4) She mustnt abuse anyone in this room.

5) They must start working on the report before its too late.

6) You must be very hungry after such a long trip!

7) Dear, you must keep silence in the library.

8) I must have understood that before! Im sorry.

9) Everybody must leave this area right now!