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Here are the completed sentences: 1. He didn't come because he was sick. He didn't come because of his illness. 2. The train was late because the fog was thick. Because of the thick fog. 3. The plane couldn't take off because the weather was bad. Because of the bad weather. 4. She stayed at home because her mother was sick. Because of her sick mother. 5. All the teachers love him because his conduct is good. Because of his good conduct. 6. We couldn't study because it was noisy. Because of the noise. 7. Mary can't sleep because there was the noise. Because of the noise. 8. His wife usually gives him a list because he often forgets things. Because of his forgetfulness. 9. He left school because his life was hard. Because of his hard life. 10. Because he got up early, he wasn't late for the first train. Because of getting up early. 11. Nick is often punished because he is lazy. Because of his laziness. 12. Karen works on Sundays because she gets paid extra. Because of the extra pay. 13. We didn't go fishing because the water was rough. Because of the rough water. 14. Because there were obstacles, the building didn't go along as planned. Because of the obstacles. 15. Although she was ill, she went to school. In spite of her illness. 16. She didn't eat much though she was hungry. Despite her hunger. 17. I accepted the job although the salary was low. In spite of the low salary. 18. He didn't leave school even though his family was poor. Despite his family's poverty. 19. The flight was not delayed though it was foggy. Despite the fog. 20. Even though it was cold, I went swimming. In spite of the cold. 21. These students didn't arrive late although there was a traffic jam. Despite the traffic jam.