must, have to, should (obligation)(1)

must, have to, should (obligation)(1)

Choose the correct answer.

1. I think people should recycleshould to recycleought recyclemore paper and glass.
2. The museum is free. You have todon't have tomustn'tpay.
3. You mustdon't have tomustn'tpark here. It's an emergency exit.
4. You shouldn'taren't alloweddon't have tosmoke. It's bad for you.
5. I musthadoughtto wear a uniform when I was at school.
6. You shouldmustoughtto phone if you're going to be late.