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Exercise 1.complete the sentences below with ''when''or ''while''.

1. ......... I heard the doorbell,I went to open the door.
2. ........you saw Eric,was he with Linda?
3. I was sitting at the cafe .........someone stole my bag.
4.I hurt my back ........ I was trying to lift the piano.
5. ......... we were standing outside the cinema ,someone called my name.