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3 Choose the correct words.
1 A best friend must / doesn't have to always be
honest and tell the truth.
2 John doesn't have to / mustn't do any
homework tonight. He did it all last night.
3 You don't have to / mustn't talk in the library.
You have to / mustn't study quietly.
4 I have to / don't have to phone Jack. I talked
to him at school today.
5 You have to / don't have to keep Monica's
secret. She thinks you're extremely honest.​