Passenger airplanes mostly fly (a) _______ speeds less than that (b) _______ sound. Airplanes (c) _______ can fly (d) _______ greater speeds have been built. This is (e) _______ if they fly (f) _______ speeds greater (g) _______ the speed of sound, (h) _______ fuel consumption increases enormously.
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what should we fill in this... noun pronoun adjective tenses etc
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