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Exercise 1.complete the sentences below with ''when''or ''while''.
1. I was having lunch ....... james arrived.
2. The salesman was helping a custome....... the thief came into the store.
3. ........ my sister was washing her hair,I was doing my homework.
4. ........ I was shopping at the supermarket,the children waited in the car.
5. I was at he bookstore .......I met Jim.