根據下面短文內容，在短文的空格處填上一個恰當的詞，使短文完整、通順。
   Jenny is eleven years old.She used to have a bad habit.She bit（咬） her nails（指甲）. "I used to do it when I was young，" she says. "I wanted to （1）

stop

stop

，and sometimes I even thought I had to give up for a day.But the next day I knew，I was doing it again." Her friend Mia used to play with her long hair.
   It seems（2）

hard

hard

to break bad habits.But if you are ready，you can try to do the following things.
   Keep a diary for a day or two.
   Write down your feelings when your bad habit appears.The more you understand the（3）

reason

reason

behind your habit，the better you can control it.
   Pay attention to（4）

when

when

your bad habit appears.
   Do you often eat junk food or candy when you watch TV？Do you usually think about sending messages to your friends when you do homework？Then think about ways to change and try to find other ways to calm yourself，（5）

like

like

slow talks and deep breath（呼吸）.
   Break bad habits by doing useful things.
（6）

Instead

Instead

of biting your nails or playing with your hair，keep your fingers busy writing or drawing.Eat some fruit rather than junk food.
   Hold on to it.
   Maybe you've heard "Old habits die hard".Well，it's true.It usually（7）

takes

takes

three weeks to a month to break a bad habit.But don't give（8）

it

it

up and you'll have more success than failure in the end.