Must/mustn't Choose the correct option (must or mustn’t).

1. You
keep off the grass.
2. Children
talk to strangers.
3. You
use a computer for more than 5 hours straight.
4. You
keep pets in cages.
5. You
be quiet at the library.
6. You
throw rubbish on the ground.
7. We
save water!
8. He
drive safe!
9. We
wash our hands more often.
10. You
eat soup every day.