В6Вставьте в предложение подходящий по смыслу модальный глагол: must, mustnt, have

В6
Воткните в предложение подходящий по смыслу модальный глагол: must, mustnt, have to, can, cant, may, should,shouldnt neednt, need и если сможете, то растолкуйте почему так, а не по другому.
1. You ____ do the washing up, Ill do it later.
2. Sorry, I ____ understand you. I dont speak Russian.
3. You ____ drive a car without a seat belt.
4. ____ I stay here with you today?
5. Cheetah ____ run very fast.
6. Children ____ go to bed earlier than adults.
7. They ____ gat the agreement from their boss before starting the project.
8. You ____ pay more attention to your studying.