Fill in the gaps using these collocations

1. We got word that the flood is bringing ______________________ into the bay.

2. ______________________ has declined in recent decades thanks to a combination of greater fuel efficiency per vehicle, cleaner motor fuels, and onboard technological improvements, such as catalytic converters.

3. The most common sources of ______________________ are leaking underground storage tanks, septic tanks, municipal landfills, and farming practices such as pesticide use in agricultural production.

4. The main sources of ______________________ are cars and motorcycles (both mechanical noise and horns), construction work.

5. ______________________ is put directly to the air, such as smoke and car exhausts.

6. In ______________________, a compound is released into the air. This compound is then modified into some other form, either by reaction with another chemical present in the air or by a reaction with sunlight.

7. ______________________ is a term used to describe the release of heat into the environment by human activities.

8. Five percent of ___________________ in oceans is due to major tanker accidents.

9. ______________________ must be retained on-site.

10. Advertisements on buses, bill boards, overhead wires, buildings etc, cause __________________.

11. A new form of ______________________ now greets us on our local interstates. It's those billboards featuring strip joints, complete with suggestive pictures and tease lines.

2. READING & VOCABLARY ___________________________________________