This math question is too difficult. Can you help me?

What’s your English teacher’s name?—name is John Smith.

Harry Potter Ⅶ will be on this Saturday evening. Would you like to go to see it with me? — No, thanks. I it.

How nice your watch is! How much did you ________ for it?—120 yuan.

―Whatyour English teacher doing now?―He _____ a newspaper.