16. There are whole species at risk of dying out. We ____________ take action!, must, might, 17. Did you know that about 15 litres of water are required to produce one kilo of beef? That’s why human beings ____________ eat more vegetables and less meat., should, can, 18. Unless we stop global warming, polar bears ____________ become extinct., can, could, 19. The first thing that ____________ strike you about Addis Ababa is its altitude., will, can, 20. Who ____________ we invite to the planning meeting?, shall, would, 21a. I ____________ like to be a conservationist, but it will be extremely difficult., would, shall, 21b. I would like to be a conservationist, but it ____________ be extremely difficult., will, must, 22a. I don’t think we ____________ interfere with the ecosystem., should, must, 22b. We ____________ make it unbalanced., can, might, 23a. Plastic is dangerous to the environment so we ____________ limit its use., would, must, 23b. If we don’t, we ____________ regret it., will, can, 24a. We ____________ lose more species before we learn our lesson about conservation., may, can, 24b. We really ____________ think more carefully about what we are doing to the Earth., can, must, 25a. Meat is a good source of protein, but there ____________ be no doubt that raising cattle is bad for the environment., will, can, 25b. Moving to a plant-based diet ____________ be the best thing we ever do for our planet., might, shall

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