Put in am, can, can’t, couldn’t, have, had to, haven’t been able to, must, must be or must have:

Remember me?
There was a knock at the door. I opened it and saw a stranger. “Hello, Fred,” he cried. “… I come in?” “How do you know my name?” I asked. “We met ten years ago on a ferry-boat and you gave me your card.” “You … mistaken,” I said. “No, I … not” the stranger said. He produced my card” Fred Ames. I … given it to him ten years ago, but “I … remember you,” I said. “We exchanged cards years ago, “the stranger said. “You said, “You … come and stay with us as long as you like any time you’re in England.” “I’m sorry I … wait so many years before coming to visit you. I’ve been so busy, I …, but here I am at last! Better late than never! I’ve just arrived on the ferry. My wife and children are in the car and we wonder if we … stay with you for a month.”