Question

Fill in the Blanks

Passenger airplanes mostly fly (a) __at_speeds less than that (b) sound. Airplanes (C)
can fly (d)
greater speeds have been built. This is (e)
if they fly (0)
speeds greater (9) the speed of sound, (h) fuel consumption increases
enormously.​

Answer 1

A) of

B) that

C) more

D) revolutionary

E) at

F) than

G) the