保持-------the classroom clean.

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• The classroom is enough bright.Pleaseturn off the lights.怎么改?
• ___are big and bright.A The classroom's windows B The windows of the classroom
• 调换词语的顺序,给句子换个说法,但意思保持不变.（可适当增减个别字词） 多少条岭,在疾驶的火车上看了几个钟头,即看不完,也看不厌
• 改错The (lights) (in) the classroom (is) (bright)
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• clean the classroom
• clean the classroom是怎么意思?