I was walking through (1)______ city centre recently when I found (2)______ strange old key lying on the pavement. I didn’t know how it had got there and I began to imagine it might unlock (3)______ front door of a big old house – or even (4)______ ancient castle somewhere! I picked up (5)______ key and put it into my pocket, then decided to take it to (6)______ City Museum. There I was introduced to (7)______ expert in historic buildings, who knew exactly where it had come from – and I was given (8)______ reward of €50 for being honest and returning it. So, I was very happy!