keep the noise

keep the noise keep from?keep from sth 比如keep from the noise Keep noise to the least翻译为汉语 We must keep the noise under 50dB（分贝） here.The noise must ______ ______under50dB here You should ________in the library.A.smoke B.make noise C.keep quite 改为被动句:We must keep the noise under 50dbs here ‘keep quite' means you ( )make noise here 1.miss chen tells us( to keep/keep)the environment clean.2.please tell your father (not make/not to make) any noise.the baby is sleep. Keep the noise down.You have got it.那是分开的两句话没有一点联系的 out of the noise e____ in the noise 主动语态改为被动语态,在什么情况下主动语态的主语被省略?eg:We must keep the noise under 45dbs hereg:We must keep the noise under 45dbs here(改为被动语态）The noise must be kept under 45 dbs here.为什么we被省略?什 keep the keep the keep the keep the keep the Keep the