They must clean their classroom.
他们必须打扫他们的教室。
They clean their classroom in the afternoon...
他们下午打扫教室。
The students take turns to clean up their classroom.
学生们轮流打扫教室。
They feel it their duty to keep the classroom clean.
他们认为连结教室洁净是他们的职务和责任。
The children cooperated with their teachers in keeping the classroom clean.
孩子们和老师一起保持教室整洁。
I think their classroom is as clean as ours.
我认为他们的教室和我们的教室一样清洁。
They want to keep their classroom clean and tidy.
他们想让教室保持整洁。
They usually keep their classroom clean.
他们通常让教室保持清洁。
They usually keep their classroom clean.
他们通常让教室保持清洁。
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