Jim is a yong man who works in a library.Compared with buses,Jim prefer riding bicycles to work everyday. During his part time,reading some interesting books is his first choice.Every morning Jim'mother walks to the grocery to start the day.She sells fruits and vegetables.There is no doubt that she loves the job very munch.Jim'father is a buinessman who drives to the glass building to make a living.He is just the piller to the family,Jim'little sister takes buses to the clothing store to start everyday.As for Jim,the little sister is what he wants to protect forever.