Question

Answer 1

1. ...  is spoken in the world by many people

2. ... the water isn't contaminated, people won't get more disseases

3. ... David had gone home , we arrived

4. ... birds leave their habitats and plants die

Answer 2

1. English is spoken by many people in the world.
2. If the water is contaminated, people will get more diseases.
3. After David had gone home, we arrived.
4. Environment pollution makes birds leave their habitats and plants die.