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You ________ smoke on buses.
mustn’t
Oops!
Okay!
Teachers ________ to work on Sunday.
don’t have to
Oops!
Okay!
Machine workers ____________ work when they are tired.
mustn't / don't have to
Oops!
Okay!
Student __________ wear uniforms at school.
have to
Oops!
Okay!
The museum is free. You _______ pay.
don't have to
Oops!
Okay!
You ________ drop litter here. It's against the rules!!
mustn't
Oops!
Okay!
It's a great book! You _______ read it.
must
Oops!
Okay!
We ____________ obey the traffic police.
have to
Oops!
Okay!
You __________ clean the floor. I've already done it.
don't have to
Oops!
Okay!
You _______ park here. It's an emergency exit.
mustn't
Oops!
Okay!
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