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III. Complete the sentences with must (not), (do not) have to, need (not), can (not), could (not)
21. You ______________ lock the door when you go out. There have been a lot of break-in recently.
22. A person ____________ to become rich and famous in order to live a successful life.
23. I don’t want anyone to know this. You ______________ tell anyone.
24. Susan: We have enough food for dinner, so I______________go shopping today.
25. We ____________ repair the car ourselves. We took it to garage.