完成对话
A: How was your vacation, Fred?
B: ____ .
A: ____ ?
B: I went to the U.S. with my parents.
A: Cool! ____  in the U.S.?
B: First we went to Los Angeles(洛杉矶). My uncle lives there. Then we went to New York to see my cousin.
A: ____ ?
B: It was a little warm but sunny.
A: Did you see any movie stars in Los Angeles?
B: No, but I saw Tom Cruise in New York. He was at a restaurant! I got his autograph.
A: Wow! That’s great!  What else did you do in New York?
B: Hmm…Oh yeah, I also went to Central Park.____ there! .

The company has produced a new type of computer. You will probably see the product _______ wherever you go.

计算 $\left(\frac{2x}{x^2-1}+\frac{x-1}{x+1}\right)$$÷$$\frac{1}{x^2-1}$的结果是（　　）

（ $1$ ）求椭圆的方程．

根据图中某牙膏商标上的部分文字，用化学用语填空．