Look! There is a 'No Fishing' sign here. You _______ fish here, must not, must, should, should not, ​We _______ plant trees to create more oxygen for the planet., should, must, You _______ leave the taps running. It wastes water., Should not, Must not, ​We _______ unplug electrical devices to save energy, must, should, must not, Should not, ​Stop! You _______ throw rubbish here. Look at the sign., should not, must not, ​You _______ pick up rubbish when you see it in the park., must, should, ​We _______ use public transportation to reduce air pollution., should , must, ​We _______ protect animals' habitats. They have a right to live., should, must, ​It is strictly forbidden! You _______ light fire in the forest., must not, should not, You _______ use eco-friendly products to protect the Earth., mıust, should, ​You _______ leave the lights on when you go out. It wastes energy., must not, should not, To prevent air pollution, factories _______ use filters on their chimneys, should, must, You _______ hunt endangered animals. It is illegal worldwide., should not, must not, If we want to drink clean water, we _______ stop polluting the rivers., must, should, We _______ waste water while brushing our teeth., must not, should not, We _______ sort out our rubbish as glass, paper, and plastic., should, must, You _______ leave the lights on during the day., must, Should.

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