When I am happy, I go to the park. , , I will pass the exam if I work hard., , I won't catch the bus on time unless I leave early. , , When you are very tired, you feel sleepy. , , If it's very cold tomorrow, I will stay at home. , , When we drive our cars, we contribute to air pollution., , If we use public transport more often, it will help to deal with air pollution., .

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