Помогите с ответом Fill in the proper auxiliary verb 1) They....working in the reading...

Question

Помогите с ответом
Fill in the proper auxiliary verb
1) They....working in the reading room
2) Where... you stay when you were in Paris?
3) Wow! You...built a new house!
4) I...not know the answer to this question
5) Where...you go after school tomorrow?
6) What...you doing at this time yesterday?

Answer 1

They are working in the reading room.
Where did you stay when you were in Paris?
Wow! You have built a new house!
I don't know the answer to this question.
Where will you go after school tomorrow?
What were you doing at this time yesterday?