Question

(IV) Open the brackets and write the verbs in the correct form.
Bell's extensive knowledge of the nature of sound and his
understanding of music (1) (to enable) him to conjecture
the possibility of transmitting multiple messages over the same
wire at the same time. Although the idea of a multiple telegraph (3)
(to be) in existence for some time, Bell (3) (to offer) his own musical or harmonic approach as a possible
(to base) practical solution. His «harmonic telegraph» (4)
on the principle that several notes could be sent simultaneously
along the same wire if the notes or signals differed in pitch. He
(to prove) that different tones would vary the strength
of an electric current in a wire.

Answer 1

Відповідь:

Bell's extensive knowledge of the nature of sound and his understanding of music (1) enabled him to conjecture the possibility of transmitting multiple messages over the same wire at the same time. Although the idea of a multiple telegraph (2) was in existence for some time, Bell (3) offered his own musical or harmonic approach as a possible (4) practical solution. His «harmonic telegraph» (5) was based on the principle that several notes could be sent simultaneously along the same wire if the notes or signals differed in pitch. He (6) proved that different tones would vary the strength of an electric current in a wire.