We must help ______(keep) our enviroment clean.

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keep/ to keep
两个答案都可以
再问： My mother missed _____ in the country. A to live B live C living D lived 我看今晚要下雨 It _______ ______ _____ that it will rain tonight.
再答： C It looks as if that it will rain tonight.

We must help ______(keep) our enviroment clean. We must keep our room clean.Dirt ... We must keep our school clean. 初中英语变为被动语态we must keep our classroom clean we must keep our classroom clean改被动语态 We must keep our classroom clean The sentence stucture here We must keep our classroom clean and tidy句子结构 We must keep our classroom (clean) every day We must keep our bedrooms_ A:as clean as possible B:as clean -What should we do?-We must keep our classroom _____.A.clean we must keep our classroom( ). You must keep the bedroom ______(clean)