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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?

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?