. 7. He was not in town, therefore he was not present at our meeting. If ... . 8. The pavement was so slippery that I fell and hurt my leg. If ... . 9. The sea is rough, and we cannot sail to the island. If ... . 10. They made a fire, and the frightened wolves ran away. If ... . 11. It is late, and I have to go home. If ... . 12. I was expecting my friend to come, that's why I couldn't go to the cinema with you. If ... . 13. He always gets top marks in mathematics because it is his favourite subject and he works a lot at it. If ... . 14. I didn't translate the article yesterday because I had no dictionary. If ... . 15. We lost our way because the night was pitch-dark. If ... . 16. The box was so heavy that I couldn't carry it. That's why I took a taxi. If ... .