1. We haven't met for a long time.
2. Because Long studied hard, he passed the exam.
3. I am a member of the anti-pollution program in my school, so I often go to school by bus?
4. How long have you bought this dictionary?
5. The accident made me late.
6. I haven't had such a delicious meal before.
7. She failed the University entrance exam due to her bad grades.
8. Phong's laziness leads to a lot of bad marks.
9. The polluted water results in many fish's death.
10. The polluted water caused the fish's death.