Помогите, пожалуйстаНужно воткнуть must, mustn039;t, have to, don039;t have to, can,

Помогите, пожалуйста
Нужно вставить must, mustn't, have to, don't have to, can, can't (+ растолкуйте, почему поставили)

1.Tell Mark and Tony they ______ stay in bed till 9 o'clock if they want. They don't have school today.
2.You _____ get a visa to visit Nepal. But I don't think it's very expensive.
3.I'm afraid you _______ take all your toys with you, girls. The car is too small.
4.The symptoms look very serious. You _____ stay in bed for five days and take these pills three times a day.
5.You _____ bring a friend if you like.
6.Fortunately we ______ take warm clothes with us. It's very hot in Greece at this time of the year.
7.Can't you see the sign, young man? You ____ drive so fast on this road! It's forbidden!
8.You ____ shout at me! I can hear you very well.