While radio broadcasting was still【C1】_____________ its early stage the wonder of televisi

on was【C2】_____________ being developed. The first step towards its invention was【C3】___________ in 1873 but the person responsible for developing【C4】_________ was John Logie Baird. In 1926 he gave the【C5】 _________ of a television picture.

As a home entertainment,【C6】__________ rapidly became more popular than any【C7】__________ form. A news broadcast became more immediate【C8】________ people could actually see the scene 【C9】 __________ question and the movements of the figures. Films could also be available. One of the advantages of travel programmes was the【C10】___________ of far-away places which many viewers【C11】 __________ not otherwise have seen.【C12】___________ much of the entertainment was of a popular 【C13】 __________ like quiz competitions, some remarkable cultural programmes were also broadcast. Just as【C14】_________ radio in earlier days, a group of actors and actresses became familiar in 【C15】 _____________ household.【C16】__________ of the most popular programmes on television was sport and an interesting【C17】________ of the television broadcast was the increased 【C18】___________ at the actual events. How far this was due to a growth in interest【C19】_________ the game and how far out of the people's desire to appear on the【C20】__________ is not clear.

【C1】

A．during

B．on

C．in

D．with