It is good manners to help ____ in trouble.

It is good manners to help ____ in touble. It's good to help people___are in trouble. it is good manners to wait in line.既然是is 后面为什么是manners （mann It is good manners in public. Is it good manners to others'talking? But it is good to know that all manners begin in the same wa it is a good beginning to help those who have trouble climbi It’s good manners not to shout in public.It's bad manners __ This is a good w( ) to help the people in trouble This is a good w___ to help the people in trouble It's good manners to wait in l_____. 为什么是it is good/bad manners to do sth.