6. Because he has good looks, he is popular with many girls
7. Because he had a serious sickness, he couldn't come to the class
8. Because there was too much exhaust fume, people have to wear gauze marks in the streets
9. Because they performed well, they won the first prize
10. Because you advised us, we didn't use that poisonous chemical
1. Because of my sickness, I do not go out
2. Because of the polluted water, we can't swim in that river
3. Because of Nga's sore leg, she had difficulty in walking
4. Because of his bad behavior, he found himself in trouble
5. Because of the snow, we didn't go out for a walk.