Вставить модальные глаголы , не считая последних 2-ух предложений

1. With my left хэнд I can also draw simple pictures and write a little.
2. Now I can swim quite well, but I couldn't last summer.
3. The teacher says we may leave the seats and walk up and down the class.
4. We need hurry in order not to be late for class.
5. You could have done all the four exercises in writing. We had to do exercises 3 and 4 orally.
6. You shouldn't have laughed as loud as that.
7. How old is our Geography teacher, I wonder? She must be about 22 or 50. I don't know, but I can guess.
8. If Alice is not careful enough, she can fall down into the water and be drowned.