1) We ___________ use plastic shopping bags.  a) must b) mustn't  c) is d) isn't 2) Big cars consume too much petrol, so we ___________ use smaller ones.  a) must b) mustn't c) is d) wasn't 3) Biz daha çok ağaç yetiştirmeliyiz. a) We must keep the environment clean. b) We must protect the animals. c) We must grow more trees.  d) We must recycle the garbages. 4) Biz hayvanları korumalıyız. a) We must protect the animals. b) We must keep the environment clean. c) We must grow more trees. d) We mustn't cut down trees. 5) Deforestation is a great problem on earth. People ___________.   a) can save energy. b) will harm the sea life.  c) should use solar energy. d) must plant trees. 6) Some factories ___________ the air. a) clean b) pollute c) disappear d) wash 7) We should ___________ glass, plastic metal and paper. a) repair b) waste c) reduce d) recycle 8) Icebergs are melting because of ___________. a) rainforest b) ocean c) global warming d) pollution 9) Billie usually uses public transportation instead of her own car.  a) b) c) d) 10) We should ___________ the television when we don't use it. a) turn on b) damage c) breathe d) unplug 11) We should use ___________ to protect our planet. a) fertilizers b) pesticides c) exhaust gases d) recycled products

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