根据句意和汉语提示，在空白处填入适当的单词。

1. —I like this camera! Is it yours?

   —Yes, I ________ (花费) 1,200 yuan on it last year.

2. —How often do you play badminton with your classmates?

   —________ (一次) a week.

3. —I am worried I'm getting fatter.

   —You should eat _________ (少) food and do more exercise.

4. Huaguo Mountain has become the _________ (象征) of Lianyungang.