Ответ:

  1. How many pencils have you got?
  2. How many pens has she got?
  3. How many exercise-books has he got?
  4. How many books has Ken got?
  5. How many teachers have we got?
  6. How many rubbers has your sister got?
  7. How many pupils have they got?

Правило: have употребляется с I, you, we, they; has — с he, she, it и существительными в единственном числе.