1) If people ______ more trees, the air will be cleaner. a) plant b) will plant c) plating d) planted 2) The sea will be polluted if people ______ throwing plastic bottles into it. a) keeps b) keep c) kept d) will keep 3) A tourist won’t visit the island if it _________ dirty and polluted. a) look b) looks c) looking d) looked 4) If a plastic bottle ______ recycled, it will end up in the landfill. a) don't get b) doesn't get c) didn't get d) won't get 5) Will a student learn much about the environment if he ______ to the Eco Club? a) doesn't join b) don't join c) isn't joining d) didn't join 6) Unless shops ______ plastic bags, customers will bring their own bags. a) offer b) offers c) is offering d) offered 7) If a tree is cut down, an animal ______ lose its home. a) will b) won't c) doesn't d) does 8) Won’t the air be fresher if a city ______ more parks? a) build b) builds c) is building d) built 9) If we ______ too much energy at home, our electricity bills will be very high, and the environment ______ more polluted. a) wasted / became b) waste / will become c) will waste / becomes d) waste / became 10) Unless everyone ______ part in cleaning up the beaches, tourists won’t come, and the local economy ______ badly affected. a) take / will be b) takes / will be c) will take / is d) taking / will be 11) Unless we reduce the use of cars in big cities, the air ______ cleaner, and people’s health ______ worse. a) won’t be / will become b) isn’t / becomes c) will be / won’t become d) wouldn’t be / becomes 12) People won’t be able to breathe fresh air ______ we plant more trees and stop cutting down forests. a) if b) unless c) because d) when 

First Conditional with "if" or "unless"

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