1) is he want to be a teacher or a doctor?
2) Is he teacher or a doctor?
3) Is he has piano or a guitar?
4) Are they have piano or a guitar?
5) Is he in the Omsk or Smolensk?
6) Is he work in the Omsk or in the Smolensk?
7) Are they work in the Omsk or in the Smolensk?