13. B-installed
14. C-read
15. A-If
16. B-published
Part B:
1. Water is necessary for us
2. The waste chemicals from factories are now seriously polluting water on the earth
3. We will have no fresh water to use
4. A dripping faucet can waste 500 liters of water a month
5. We should turn the faucet off after using
6. No, I don't / Yes, I do