(mustn't
don't have to
must
have to
should
shouldn't)
1.Do we ___ help with the housework?
2.They ___drive so fast! It's dangerous.
3.You ___do the shopping.I went this morning.
4.She ___work in her dad's café every evening.
5.You cheat in exams.
6.It's late. You___ switch off the TV.

In my country you are supposed to let people exit from the elevator or trains first.It is thought to be polite. It is considered impolite to prevent people to go out. 
You should not cut someone off. It is thought to be impolite. You should wait till they finish what they are saying.You should chew with your mouth closed. It is thought to be polite. And you should not start talking with a mouthful of food.
In my country it is considered polite to treat people nicely even if you don't have to.
Don't talk loudly in public places. It is thought to be impolite.

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Объяснение:

Harry Potter

I've seen this movie many times and I've read the book recently. Perhaps I can talk about the movie in more detail. Let's get to the story.

What would you say about a letter from the world of magic. I think in our simple and rational society such things can be perceived only as a sign of madness. But it was the beginning of amazing events in the life of an 11-year-old boy. That all his conscious life he had to live with cruel relatives, who only tolerate him because of family obligations. Upon learning of such a happy event, the child leaves to study at Hogwarts School of Magic. There he will meet loyal friends and learn about his blood enemy. Truly the greatest adventure for the most ordinary child. Let magic and wizardry give you an unforgettable experience.

I can say that the very first movie is most in the spirit of the book. It really is a wonderful children's work. I can advise you to watch it. And disregard the words of the critics and those who think it's all pagan machinations. One should enjoy the beautiful fairy tale, which has all the attributes of a real children's read and movie.