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1. a) could, b) must, c) would, d) should
2. a) were believing, b) had believed, c) used to believe, d) would believe
3. a) can’t, b) mustn’t, c) shouldn’t, d) don’t have to
4. a) couldn’t, b) must, c) ought to, d) had to
5. a) shouldn’t, b) don’t have to, c) couldn’t, d) didn’t have to

Do modern children need household chores?
Until the 1980s, adolescent and pre-adolescent children were expected to do a variety of household chores: they (1) (...)

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