How he _______ get out of the prison ______ a mystery.

Don't you think it a pity that John ______ have behaved roughly toward us?

I told your friend how to get to the hotel, but perhaps I______have driven her here.

 “Look at these tracks. It _______ be a wolf.” “Don’t be so sure. I think it _______ be a fox.”

I＿＿＿＿＿＿＿＿you a beautiful present for your birthday,but I was short of money at that time.