Choose a,b or c 1. We ___ throw rubbish in rivers because the fish will die.
a. don’t have to
b. must
c. mustn’t
2. Ryan got up very early yesterday because he be at the dentist’s at 7 o’clock.
a. has to
b. must
c. had to
3. It’s cold, so you wait for me at the entrance. I’ll meet you inside the art gallery.
a. must
b. don’t have to
c. mustn’t
4. You ___ swim here. It’s dangerous.
a. don’t have to
b. can’t
c. have to
5. Martha can’t see well, so she __ wear glasses.
a. doesn’t have to
b. have to
c. had to
6. Iris had an accident. She go to the doctor.
a. must
b. mustn’t
c. don’t have to
