Solutions Upper_Unit 3 Review
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You don’t have to / mustn’t wear hiking boots during the walk. It isn’t far and the paths are good. Wear trainers if you prefer.
don't have to
Students ought not to / needn’t leave their bags in the corridor because they may cause an accident.
ought not to
We’re flying to the USA on Sunday. Do you think I must / should exchange euros for dollars before we go?
should
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