Question

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TELEPHONE
In a period when several inventors (33) ........... toward more effective
communication by wire, Alexander Bell, a teacher of the deaf, came in first
with his invention of the telephone. It was his fascination with the human ear,
especially the way sound waves cause the soft membrane of the eardrum
(34) ........... , that led him to believe that voices could be sent mechanically.
The patent was granted (35) ........... March 7, 1876. Three days later, Bell's
assistant became the first person to receive a phone call. Bell, who (36) ...........
acid on his clothes, called over the phone, "Mr Watson, come here. I want
you." Just over a year (37) ........... , the first telephone line was installed.
33 А have worked В had worked C work D were working
34 А vibrate В to vibrate C vibrated D vibrates
35 А on В at C in D since
36 А spilled В was spilling C has spilled D had spilled
37 А lately В late C latest D later

Answer 1

In a period when several inventors (33) D) were working toward more effective communication by wire, Alexander Bell, a teacher of the deaf, came in first with his invention of the telephone. It was his fascination with the human ear, especially the way sound waves cause the soft membrane of the eardrum (34) А) vibrate, that led him to believe that voices could be sent mechanically.
The patent was granted (35)А) on March 7, 1876. Three days later, Bell's
assistant became the first person to receive a phone call. Bell, who (36) D) had spilled acid on his clothes, called over the phone, "Mr Watson, come here. I want you." Just over a year (37) D) later , the first telephone line was installed.