Our city is {#blank#}1{#/blank#}．There is／are {#blank#}2{#/blank#}．The rivers are {#blank#}3{#/blank#}．The air is {#blank#}4{#/blank#}．We should keep our city clean and beautiful．We should {#blank#}5{#/blank#}it. We mustn't {#blank#}6{#/blank#} it．

提示：Children's Day, go to the park, many people, play happily, fly a kite, be easy for us, take pictures

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