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1. Mr. Smith(to arrive) at the office and(to turn) on the computer 2 Sarah(to write) a letter yesterday when the lights(to go) out. 3. I (not to book) my holiday yet. 4. He(to apologize) because he(to miss) the last meeting 5. How long they(to cycle) before they(to stop) for a rest yesterday. 6. Last night Beth(to thank) Chris for the lovely flowers which he(to buy) for her 7. I(not to ride) a bike since last month. 8. Last week my sister(to borrow) my sweater. while she(to wear) it she(to spill) some juice on it.9. The reporters (to inform) that the police to discover a bomb in the office. 10. It(to rain) for half an hour when I(to leave) home. 11. when David(to enter) the kitchen he(to see) that his cat(to eat) his goldfish. 12. At 7 o'clock yesterday Cathy(to sleep) as she(to be) tired.

1)arrived turned on2)was writing, went out3)have not booked4) apologized,had missed5)were cycling  before they stopped6)thanked,  had bought7)have been riding8)borrowed, was wearing it spilled9)informed10)was raining,left11)entered.saw,was eating 12)was sleeping ,was tired