Ex1:

1. True

2. False

3. True

4. False

5. False

Ex2:

1. If people cared much about environment, they wouldn't make it worse.

2. Since she had drunk contaminated water in a long time, she suffered from a serious disease.

3. ​If the drainage system, weren't damaged, there would be enough water for the crop.

4. If I were you, I would turn off more lights in the house to reduce my eyestrain.

5. If the public transport is improved, more people will use it.

Ex3:

1. He was rescued out of the time by the firefighter 

2. A big number of buildings in the city has been distroyed by the earthwake.

3. Why weren't us sent an ambulance?

4. A lot of clothes, foods and drink were donated to support the victims of the flood.

5. He was taken to the hospital for an immediate surgery.

CHÚC CẬU HỌC TỐT!!! Cho mình CTLHN nhé!!