Задание 7. Изберите нужный модальный глагол (a, b, c, d).When paraphrasing

Задание 7. Выберите необходимый модальный глагол (a, b, c, d).
When paraphrasing the sentence use the modal verb from a, b, c, или d.
1. The teacher gave us permission to leave the room.
We . leave the room.
a. can с. may
b. might d. must
2. You are obliged to finish your work in time.
You . finish your work in time.
a. must с. can
b. had to d. could
3. I find it impossible to understand them
I . not understand them.
a. could с. have to
b. should d. can
4. They advise me to go the chemist's shop.
I _ go to the chemist's shop.
a. might с. should
b. had to d. can
5. You should be very careful when working in the laboratory.
You to be very careful when working in the laboratory.
a. ought с can
b. must d. might