用所给单词的正确形式填空。（每小题1分，共5分）There is a computer on the _________(teacher) desk.
Fruits and vegetables are _________ (health) food, and they are good for you..
Remember: brush your _________ (tooth) every morning.
________（they）favorite subject is science.
My mother _________ (not buy) any chocolate because it isn’t very healthy.