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牛津版（深圳·广州）2018-2019学年初中英语七年级下册Module 2 Unit 4第4课时Listening & Speaking
—Yes. They can take harmful gases and provide us ______ oxygen.
Last year, they {#blank#}1{#/blank#} the {#blank#}2{#/blank#} of workers in their company.
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