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**Exercise 3** Rewrite these sentences with the given words or phrases.
1. David had gone home before we arrived.
=> After.................................................
2. We had lunch then we took a look around the shops.
=> Before................................................
3. The light had gone out before we got out of the office.
=> When..................................................
4. After she had explained everything clearly, we started our work.
=> By the time.........................................
5. My father had watered all the plants in the garden by the time my mother came home.
=> Before..................................................