We need clean ______ to live., wood, air, century, People should ______ nature and animals., protect, disappear, pollute, Many people use the ______ to travel around the city., Pacific Ocean, underground, air, The ______ is the largest ocean in the world., Pacific Ocean, environment, nature, We all want a ______ world without wars., peaceful, deep, underground, The sea is very ______., peaceful, deep, human, ______, we were late for school., Unfortunately, Human, Nature, This place is ______ a national park., picked, called, polluted, People should not ______ trees in forests., cut down, take part in, pick up, I like to ______ in the park every weekend., a) cycle, b) disappear, c) protect, Many animals may ______ if we destroy forests., cycle, disappear, pick up, We should care about the ______., environment, century, underground, Please ______ the bottle from the floor., cut down, pick up, disappear, Air and water ______ are serious problems today., pollution, century, wood, I want to ______ the school project., take part in, disappear, cut down.

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