Three things you shouldn't do before you go to bed, 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 shouldn't do the night before an exam, 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 you should find out about a country before you visit it, Two things you shouldn't do if you have a flu, Three things you should consider if you've invited friends to dinner, 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 should do when you have a job interview, Three things you must do when you're going on a long journey by car.

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