1. ..... is a long period of time when there is little or no rain. A. Drought B. Acid rain C. Flood D. Storm 2. Stop polluting the... or there'll be fewer fish A. Water B. Air C. Land D. Ground 3. They are going to... all the plastic bags. (Collection) 4. The... sites are causing noise pollution in our city (construct) 5. We shouldn't waste... so we can reduce pollution (electric) 5. The air in the city is very...(pollute)