Find the appropriate word for (4).

Man has always been ....(1).... with flying because it ....(2).... a sense of freedom, of romance and thrill-something too ....(3).... to resist. It is the task of the ....(4).... of the skies to safeguard Indian air-space from unwelcome ....(5)..... . The Indian Air Force ....(6).... a chequered and glorious history.     From its ....(7).... days of single-engine aeroplanes like    Tempests and Spitfires to the state of the art multi-engine, supersonic MIG and Sukhoi fighters, the Indian Air Force ....(8).... a long way. In addition to the already existing    ....(9).... of aircraft and... Show more

Man has always been ....(1).... with flying because it ....(2).... a sense of freedom, of romance and thrill-something too ....(3).... to resist. It is the task of the ....(4).... of the skies to safeguard Indian air-space from unwelcome ....(5)..... . The Indian Air Force ....(6).... a chequered and glorious history.    
From its ....(7).... days of single-engine aeroplanes like    Tempests and Spitfires to the state of the art multi-engine, supersonic MIG and Sukhoi fighters, the Indian Air Force ....(8).... a long way. In addition to the already existing    ....(9).... of aircraft and weapon systems, plans are ....(10).... to enhance its air defence power and ....(11).... capability through upgradation and ....(12).... .    

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