Cindy, Jerry and Mary are giving their opinions about a good friend.  
Cindy: I think a good friend should be honest(诚实的). That's more important than any other things
and is where a good friendship starts. If a friend isn't honest, he may lose his friends' trust.
Jerry: I think a good friend has to be generous. Here "generous" doesn't mean he has to give  his
friends his lunch money or his clothes. It means he should share(分享) his ideas and feelings with
his friends. In fact, his friends can know him better in this way.
Mary: In my opinion, a good friend should understand his friends. When there's  something
wrong between him and his friends, he must put himself in his friends' place and  think more for his
friends.