Put the verbs in brackets into the correct tense. In pairs ask and answer questions based on the text. Alexander Graham Hell probably 0)(not/know) at the time that he 1) (invent) one of the most popular devices in modern history. In fact, he 2) (work) on a hearing device when he 3) (stumble) on the invention of the telephone. Bell 4)(try) desperately to find some way to help deaf people hear and communicate with others because he 5) (live) with his deaf mother and wife and 6) (experience) deaf people's problems first hand. Bell went on to invent numerous other things, but we 7) (always/remember) him for bringing us the telephone.
