)надо поставить в правильную форму. alexander graham bell probably 0) didn't know at the time that he 1) (invent) one of the most popular devices in modem history. in fact, he (work) on a hearing device when he (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 (always/remember) him for bringing us the telephone.
2 had been working
3 stumbled
4 tried
5 had been living
6 experienced
7 will always remember