When did you buy this house?

1/When did you buy this house?
-> How long is......................
2/This shirt cost $15 (Make the question for the underline words)
->.............................................
3/Ann offered to put me up for the night.This was very nice of hẻ.
->Ann offered..........................
4/My sister doesn't do the washing by hand any more.
->My sister used...........................
5/The meeting lasted 15 minutes before our arrival
->By the time we.................
6/I'm sorry I didn't say goodbye to her at the airport yesterday.
->I regret...................