Задание по английскому. Вместо "___" выбрать ответ (а, b или c)
1) Choose a, b or c.
1. You're in a hospital. You ___ shout!
a. must
b. mustn't
c. don't have to
2. After the party, you ___ all help me clean up. I can't do it alone.
a. has to
b. have
c. must
3. Donald can't see well. He ___ wear glasses.
a. doesn't have to
b. have to
c. has to
4. Betty ___ buy an anti-virus program last week. A virus deleted all her files.
a. has to
b. must
c. had to
5. You ___ send invitations for the party. You can send e-mails to everybody.
a. mustn't
b. had to
c. don't have to
6. The students ___ to surf the Net to find the information they need for their projects.
a. has
b. have
c. must​