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1. He (a) had breakfast and then he (b) went to work.
2. What (a) did you do when they (b) arrived?
3. She (a) found a copper axe when she (b) was walking in the forest.
4. I (a) wasn't watching TV when my friend (b) called me.
5. (a) Was Barbara cooking when the fire (b) started?
6. People (a) didn't use copper tools ten thousand years ago. They (b) made tools from stone.
7. We (a) were getting on the bus when we (b) saw an accident.