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.

钢板桩围堰必须符合下列规定：1桩尖高程符合设计要求；2经过整修或焊接的钢板桩应做（）试验；3钢板桩接长时，应采取等强度焊接接长，相邻钢板桩接头上下错开2m以上。