1) If people ___ more, the Earth will be cleaner. a) recycle b) recycled c) recycles d) will recycle 2) If we don’t save water, we ___ enough in the future. a) won’t have b) don’t have c) haven’t d) didn’t have 3) If everyone ___ public transport, the air will be fresher. a) use b) will use c) uses d) used 4) The schoolyard will look dirty if students ___ the trash. a) don’t pick up b) won’t pick up c) doesn’t pick up d) not pick up 5) If factories dump waste into the river, the fish ___ . a) dies b) will die c) dying d) died 6) If we plant more trees, we ___ more oxygen. a) get b) will get c) got d) getting 7) If it rains tomorrow, we ___ the clean-up day. a) cancel b) will cancel c) cancelled d) cancels 8) We will reduce air pollution if everyone ___ bicycles. a) ride b) will ride c) rides d) riding 9) If we don’t recycle paper, we ___ down more trees. a) will cut b)  cut c) cuts d) cutting 10) The rivers will be cleaner if people ___ waste properly. a) throw b) threw c) throw away d) throws away

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