D. Choose a, b or c.
1. You _throw rubbish in the streets.
a. mustn't
b.must
C. don't have to
2. If you want to help the environment, you_
- recycle paper, metal and glass.
a. have to
b. must to
c. had to
3. Last summer Brenda _work at her parents' restaurant.
a. has to
b. must
c. had to
4. When I was young, |_ take the bus to school. It wasn't far.
a. don't have to
b. mustn't
c. didn't have to
5.I_ study tonight because I don't have school tomorrow.
a. didn't have to
b. don't have to
c. mustn't​

pavelmishulski    1   13.05.2020 12:25    1