1. Constant exposure to noise pollution will lead in ⇒ to the loss of hearing
2. Because of ⇒ Because we turned on a lot of bulbs, our eyes got strained.
3. If he reads this article, I guess that he would ⇒ will never do any harms to environment any more.
4. The local citizens would be very happy if they were supplied with a clean ⇒ clean water.
5. If the environment were not polluted, birds wouldn’t leave their habitats and plants would ⇒ wouldn't die.