Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 31 to 35 .
Telephone was invented in the 1876 by Alexander Graham Bell, a Scotsman (31) _____ became a US citizen. The word “telephone” had been in existence since the 1830s and had been (32) _____ to a number of inventions designed to produce sounds. Bell had become interested in the possibility of long- distance speech through his work with the deaf. He was twenty- eight and his assistant, Thomas Watson, was (33) _____ twenty- one when they (34) _____ their great success on 10th March 1876. Despite their long and close association, Bell’s first (35) _____ by telephone was not “ Tom, come here, I want you”, but “ Mr. Watson, come here, I want you”