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Everyone should keep our city clean. We should keep our school clean. Give suggestions What makes the classroom dirty? What can we do to keep the school clean? Write down your own suggestion. 请写下你自己的建议。 Exercise 一、用所给词的适当形式填空。 1. Rubbish _______(make) the streets messy and dirty. 2. To ________(keep) the air clean, we should _______(take) the bus to school. 3. Let's ________(move) the desk to Helen's bedroom. 4. There are some ________(factory) in the city centry. 5 - Let's _______(walk) to school today, Mike. - Good idea. 二、 改写句子。 1. We can put rubbish in the bins.(对划线部分提问) _____ ______ we ______ to keep the street clean. 2. Smoke from cars makes the air clean.(对划线部分提问) ______ makes ___ ____ clean? 3. They see a sign in the park.(用two days ago 改写句子) They ____ a sign in the