The Earth wouldn’t be in danger if people________ (be) careful, , were , are , would be, will be, If the air in the city________ (get) polluted, it can make people sick., gets, get, will get, got, There ________ (be) less air pollution if people didn't use cars , , will be, is, are, would be, would not be, If we use public transport more, we________ (reduce) air pollution., reduce, reduces, will reduce, would reduce, What (happen) ________ if water pollution stopped?, will happen, happens, happen, would happen, If we dump poison into rivers, we ________ swim in them in the future., would not , are not, can  , can not, You________ (not be) able to see stars at night if light pollution ________ (keep) growing,, will not be / keeps , would not be / kept , are not / will keep, were not / would keep, If there ________ (be) no more pollution, the world ________ (be) a better place?, is / will be, was / would be, is / will the world be, was / would the world be.

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