1. Half the world's rain forest have already been destroyed
2. Endangered animals should be bred in conservation areas
3. A large hydroelectric dam was built on the river danube
4. He says he'll tell the authorities but it's just an empty threat
5. Why not ake the train instead of the bus.It's faster
6. Harmful insects must be killed to protect our crop
7. " Would you like having lunch with us?" "yes,I'd love to"
8.Phone me if there are any new developments
9. If you don't have anything constructive to say,I'd rather you kept quiet
10.A healthy body will be able to fight off the illness naturally without the use of medicine