) Choose the correct word for each gap 1. The scientists believe the Siberian tiger might soon become  again. a. endangered b. extinct 2.    is a form of serious pollution in many big cities. a. Smoke b. Smog 3. Each city produces a million tons of household every year. a. litter b. waste  4. Dad listens to the weather  every day. a. forecast b. prediction 5. Because of people's influence, the  changes a lot. It can lead to unpredictable results in the near future. a. weather b. climate 6. I would like to live in a nice friendly area with  streets. a. clear b. clean  7. People struggle with ecological problems . a. global b. worldwide 8. Do you think we need to   the consumption of natural resources? a. reuse b. reduce

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