Do we ____ (must,have to) be quiet in the shool library?

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Do we have to be quiet in the shool library?
=Must we be quiet in the shool library?
Who do we have to thank for this fiasco?
我们遭此惨败怨谁呢?
Do we have to wear evening dress for the banquet?
我们是不是必须穿晚礼服去参加宴会?
Is this lecture free or do we have to pay?
这个演讲是免费的,还是要付钱的?
Do we have to wear evening dress for this party?
我们是不是必须穿晚礼服去参加这次晚会?
Do we have to pay the full price for children?儿童必须付全额吗?

Do we ____ (must,have to) be quiet in the shool library? to,have,be,the,library,do,we,quiet,in(?) We must be quiet in the library. We have to be quiet in the library We also have to be quiet in the library to,have,be,the,library,do,we,quiet,in?there,lot,school,of,ru We have to be quiet in the library划线提问（ be quiet ） we must _____(be) quiet in the library. and we also have to be quiet in the library为什么不说and we have oh ,and we also have to be quiet in the library 变否定句同意表达we must keep quiet in the library You must be quiet in the library(改为同义句)