Read the passage and choose the option that best fits the gaps.

You may use the telephone every day but how much do you know about it? The telephone was invented by Alexander Bell in 1876. Bell was born in Scotland in 1847. Later he went to live in the US. Alexander Bell was always interested ___(1)___ _______ sound. He wanted to be able to send sound through a wire. He had a workshop in his house in America and did many ___(2)__________ there.
One day, while he was doing an experiment in his workshop, he was ___(3)__________ and spilt some burning liquid onto his clothes. Talking into his telephone, Bell said: “Mr. Watson, I want you to come over here immediately, please.” His assistant, Watson, was in another room far away from the workshop. ___(4)__________, he heard Bell clearly on his own telephone. Quickly, he ran to Bell’s workshop. “Mr Bell, I heard every word you said!” Watson shouted excitedly. Bell finally succeeded. He had ___(5)__________the first telephone. Later other inventors made better ones.