15. Though Ba worked hard, he failed his exam.
16. Although it was raining heavily, we decided to go to see the match.
17. Though they quarreled, they remain the best of friends.
18. Although the weather was bad, they went out for dinner.
19. Although she isn't brilliant, she studies quite well.
20. Even though the house isn't nice, I like the garden.
21. Because I am sick, I do not go out.
22. Because of the polluted water, we can't swim in that river.
23. Because of Nga's sore leg, she had difficulty in walking.
24. Because he behaved badly, he found himself in trouble.