Question

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 ()
speeds greater (9) the
speed of sound, (h)
fuel consumption increases
enormously​

Answer 1

Option a.

hope it helps you

Answer 2

Answer:

option airplanes can fly