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 15. The weather was bad. Our departure delayed. (since)

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16. The road condition is poor. There has been several accidents. (therefore)

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17. Several members have not replied for over three years. Their names have been removed from the list.

(therefore)

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18. He refused to answer the phoned. He was tired. (as)

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19. Paul was an hour late. He missed the train. (because)

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20. I borrowed your lawn mower. You weren’t using it. (as)