A person with good manners will ______ those in trouble.

A．he will do what he is asked to do
B．he knows what to do and what not to do on different occasions
C．he is always saying good words to others
D．he can make others know what good manners are

A．you can act as you like in any country
B．you can act in the same way even in different countries
C．people are indifferent to what good manners are
D．"When in Rome, do as the Romans do"