В11Вставьте в предложение подходящий по смыслу модальный глагол: must, mustnt, have

В11
Вставьте в предложение подходящий по смыслу модальный глагол: must, mustnt, have to, can, cant, may, should,shouldnt neednt, need и если сможете, то объясните почему так, а не по другому.
1. The students ___ use a calculator at the Maths lesson.
2. My mother ___ cook many delicious dishes.
3. You ___ ask his advice.
4. People ___ cross the road when the lights are red.
5. We ___ sweep the floor anymore, weve bought a vacuum-cleaner.
6. Children ___ obey their parents.
7. She ___ play chess, she doesnt know the rules.
8. They have such big muscles! They ___ be sportsmen.