It's bad _____ (manner) to speak in a library

It's bad _____ (manner) to speak in a library It is bad ___ to speak with your mouth full.A way B manner C 三个英语问题1.it's (bad manners)/(a bad manner) to talk loudly.略答案 英译汉it is good to be quiet in a library.it is bad to shout in It's good manner to do It's a good manner to do It is not polite _____(speak) loudly in the library. It's not polite to speak loudly in the library(改为同义句) It`s bad manner to talk with your mouth full.改错 It's bad ____(manner) toeat like that. it's bad to spit in public(改为同义句) ____ _____ it ’s _______(polite) to talk loudly in a library or a museu It's a good manner ____(搬动)a chair to a gust when he comes.