1. If companies.............waste into rivers and streams, sources of water .............. (pour, pollute) 2. If we...........the global warming, it............humans’ life. (not prevent, threaten) 3. If we.............to allow deforestation, there.............more floods. (continue, be) 4. If we..............public transportation, there................fewer vehicles on the road, which............air pollution then. (use, be, reduce) 5. If we .............those bottles, we................money. (recycle, save). 6. If there................more rubbish bins in the street, people.............trash in the street. (be, not thow) 7. If humans.............water, they..........out of it soon. (waste, run) 8. If more people ...........green shopping bags, the number of plastic bags .................(use, decrease) đề bài. complete first conditional sentences with the verbs given