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Complete the sentences with the correct form of the verbs in brackets. Use the Past Simple or Past Continuous.

1) _____ (you/read) books about exploration when you were a boy?

2) My grandparents _____ (not/watch) TV when aunt Helen visited them.

3) Last week I _____ (buy) a new mobile phone.

4) _______ (John/sleep) at seven o'clock yesterday?

5) Professor Thatcher _____ (work) at university when he had a brilliant idea. ​