Two things you have to do after class today, Two things you must do before you catch a plane, Three things you don't have to do when you're on holiday, Two things you don't have to do if you shop online, Two things you must do and two things you mustn't do when you're driving, Two things a teacher has to do before a class, Two things you must do if you've been invited to wedding, Three things you must do when you're going on a long journey by car.

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