If there __________ a lot of smoke, people will have lung problems., A. are, B. is, C. will be, If we __________ plastic bags, we will protect the ocean., A. reuse, B. reuses, C. will reuse, D. reusing, If there are too many cars, the air __________ smoky., A. is, B. will be, C. be, being, Which sentence is correct?, A. If we plant trees the Earth will be green., B. If we plant trees, the Earth will be green., C. If we plant trees, the Earth is green., If people __________ trash, it will pollute the river., A. throws, A. throw, C. throwing, D. will throw

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