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_____ in charge of two classes made Mrs.Li, head of Senior Grade 3, extremely tired.
Almost every teenager will experience a period in their life _____ they aren’t content with their parents.
Little did the teacher imagine that a student good at maths _____ have failed in the exam.
— I’ve never seen you so rude!— I _____ something I shouldn’t have, but I didn’t mean that.
Tom was sorry to learn that his grandfather _____ for half an hour when he got to the hospital.