Habits,whether good or bad,are gradually formed when a person does a certain thing again.He is driven by some unseen force to do the same thing repeatedly, and then a habit is formed.Once a habit is formed,it is difficult,and sometimes impossible,to get rid of.It is therefore very important that we should pay great attention to the formation of habits.Children often form bad habits, some of which remain with them as long as they live older. Persons also form bad habits lasting as long as they live,and sometimes become ruined by them. There are other habits which,when formed in early life,are of great help.Many successful men say that much of their success has something to do with certain habits in early life,such as early rising,honesty and so on. Among the habits which children should not form are laziness,lying,stealing and so on.These habits are all easily formed.Unfortunately older persons often form habits which could have been avoided. We should keep away from all these bad habits,and try to form such habits as will be good for ourselves and others. Generally speaking, it's difficult for one  _   and easy for them  _   which should be avoided.
to form bad habits;to form good habits to form good habits;to form bad habits to form such habits as wilI be good;to get rid of bad habits to get rid of bad habits;to form good habits
Question: Habits,whether good or bad,are gradually formed when a person does a certain thing again.He is driven by some unseen force to do the same thing repeatedly, and then a habit is formed.Once a habit is formed,it is difficult,and sometimes impossible,to get rid of.It is therefore very important that we should pay great attention to the formation of habits.Children often form bad habits, some of which remain with them as long as they live older. Persons also form bad habits lasting as long as they live,and sometimes become ruined by them. There are other habits which,when formed in early life,are of great help.Many successful men say that much of their success has something to do with certain habits in early life,such as early rising,honesty and so on. Among the habits which children should not form are laziness,lying,stealing and so on.These habits are all easily formed.Unfortunately older persons often form habits which could have been avoided. We should keep away from all these bad habits,and try to form such habits as will be good for ourselves and others. Generally speaking, it's difficult for one  _   and easy for them  _   which should be avoided.
A. to form bad habits;to form good habits
B. to form good habits;to form bad habits
C. to form such habits as wilI be good;to get rid of bad habits
D. to get rid of bad habits;to form good habits
Answer: