1) Cutting down a large number of trees causes serious ________. a) Pollution b) Deforestation c) Drought 2) Plastic bottles and cans are examples of ________. a) Waste b) Air quality c) Flood 3) ________ is getting worse in many big cities due to traffic and factories. a) Water shortage b) Air quality c) Endangered species 4) A long period with little or no rain leads to a ________. a) Drought b) Flood c) Pollution 5) Many animals are becoming ________ because their habitats are being destroyed. a) Waste b) Endangered species c) Climate change 6) Heavy rain caused a severe ________ in the village yesterday. a) Flood b) Drought c) Pollution 7) The rising temperature of the Earth is called ________. a) Climate change b) Water shortage c) Global warming 8) The lack of clean water in some areas leads to ________. a) Deforestation b) Water shortage c) Air quality 9) ________ refers to harmful substances released into the environment. a) Pollution b) Flood c) Global warming 10) ________ affects weather patterns all around the world. a) Waste b) Climate change c) Flood 11) Cutting trees for agriculture is a main cause of ________. a) Drought b) Global warming c) Deforestation 12) When the air is dirty and unsafe, we say the ________ is bad. a) Air quality b) Water shortage c) Waste 13) Burning fossil fuels is one of the biggest causes of ________. a) Endangered species b) Global warming c) Trash 14) Many countries are trying to protect ________ from illegal hunting. a) Drought b) Endangered species c) Waste 15) A sudden, large amount of water covering land is a ________. a) Flood b) Pollution c) Drought

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