6C - 7D - 8A - 9B - 10D - 11D - 12A - 13B - 14C - 15C - 16A - 17A - 18B - 19C - 20C - 21C - 22A - 23B
1B (pollute → pollution)
2A (don't → won't)
3D (had had → were having)
4B (destroyed → were destroyed)
- Question VIII:
1. If teachers teach environmental issues at school, students will be more aware of protecting the environment.
2. English is spoken all over the world.
3. Because factories produce waste and pour it into rivers and lakes, many rivers and lakes are poisoned.
4. After they had provided food, they cleared up the debris.
