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Rhode Island was the【C1】______of American tennis：when the United States National Championships （now the United States Open）were inaugurated in 1881，they were played on the【C2】______of the Newport Casino.Like Wimbledon，the 【C3】______became known by its【C4】______after it was moved to Forest Hills，N.Y.，in 1915.That tournament was played on grass until 1975，【C5】______clay courts were installed to equalize Grand Slam competition.
【C6】______lawn tennis was devised as a more accessible【C7】______of the old court game played in French chateaus，the manicured grass courts it【C8】______were the playgrounds of the elite.Dirt courts brought another【C9】______of tennis players into competition.
The【C10】______of cement courts in the【C11】______parks of southern California finally dispelled the sport’s country-club image.【C12】______，by the 1980s the word lawn had been【C13】______from the names of all the associations that governed the game.
Tennis can be played by two persons in【C14】______or by four in doubles.The【C15】______of the game is to hit the ball【C16】______a net and keep it in play【C17】______the opponent loses the point by【C18】______a good return.The playing area is【C19】______into two service courts and a backcourt on each side of the【C20】______.The service area on the player’s right is called the deuce court；the one on the left，the ad court.