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)1,200yuan on it last year.
（2）---How often do you play badminton with your classmates?
---____ (一次)a week.
（3）—I am worrried I’m getting fatter.
---You should eat____(少)food and do more exercise.
（4）Having many____ (帮手)makes a task easier.
（5）Huaguo Mountain has become the ____(象征)of Lianyungang.

已知函数①y=5x-4，②t=$\frac{2}{3}$​x²-6x，③y=2x³-8x²+3，④y=$\frac{3}{8}$x²-1，⑤y=$\frac{3}{x^2}-\frac{1}{x}$+2，其中二次函数的个数为（　　）

森林动物运动会中龟兔赛跑，比赛开始后观众通过比较 ____认为跑在前面的兔子运动快，由于兔子麻痹轻敌中途睡了一觉，裁判员通过比较 ____判定 最先到达终点的乌龟运动得快，物理学中用 ____表示物体运动的快慢，其计算公式为 ____

⑴how tall are you？____

⑵what did you do last Monday？____

⑶what are they going to buy？____

⑷how heavy are you？____

⑸where did you go the day before yesterday？____

A. I did my homework and read books.

B. I'm 55 kilograms.

C. I'm 1.66 metres.

D. I went to the theater the day before yesterday.

E. They are going to buy some foods and fruits.