4 Choose the correct words. 1 I saw/'d seen it after I read /'d read the book. 2 They didn't invent / hadn't invented e-books when Dad was /'d been young. 3 She answered/'d answered all the questions five minutes before the exam ended /'d ended. 4 I went/'d gone home after he left / 'd left. 5 When they got /'d got to school, lessons began / had begun, and the teacher was angry.

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