选出相对应的答句。

①What size do you want? ____        A. Yes, she does.

②Does Lulu like rabbits?  ____         B. He's a farmer.

③What's your father do?  ____         C. Size 25, please.

④Do you have any shoes? ____         D. Yes, I am.

⑤Are you a teacher? ____          E. Yes, we do.

补写句子

下列各式中，是关于x，y的二元一次方程的是（　　）

-5的相反数是 (  )