Then two years later he (agree) to give private lessons to a boy. This (give) Alexander the opportunity to continue his experiments with sound transmitters. He used to spend all his free time and most of his money, on his inventions. At that time he (have) another student who greatly ( influence) his life. She was a young girl who (lose) her hearing and the ability to speak because of a childhood illness. Her name (be) Mabel and four years later they ( get) married. Although many people (think) that the plan to invent a human voice transmitter was a waist of time, Alexander (refuse) to give up his dream. He (spend) so much time and energy on his inventions and (do) less and less work with his students so he soon (run out) of money. He was about to give up when he (meet) professor John Henry, an expert on the telegraph and electricity. Professor Henry ( realise) immediately that Alexander(make)an amazing discovery and (encourage) him to continue with his experiments. In order to survive financially Bell(have) to work on the musical telegraph, but he also(continue) working on his mechanical voice transmitter. On the summer afternoon in 1875, when Alexander (hear) the first sound transmitted over his machine, he (realise) that he finally (achieve) his goal. Almost a year later in March 1876, the first words (hear) coming through the phone. On his 29th birthday Alexander Graham Bell (register) his invention with the patent office and, because they never (see) anything like it before, they (register) his invention as “an improvement in telegraphy.” The name “telephone” (come) later.