她每天早上开始工作前都会清理她的桌子。
She ___cleans her desk every morning before starting work.
她在客人到来之前把整个厨房打扫干净了。
She ___cleaned the entire kitchen before the guests arrived.
擦洗窗户使它们保持了干净。
___Cleaning the windows helped keep them ___clean.
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