Question

____
speeds less
than that at, within,​

Answer 1

Answer:

(ix) Passenger airplane mostly fly at speeds less than that (a)

sound, (b) airplanes which can fly at supersonic speeds have

been (c) . This is because if they fly at a speed greater (d)

the speed of sound, their fuel consumption increases

enormously.

(a) (i) with, (ii) of, (iii) to, (iv) for

(b) (i) although, (ii) because, (iii) since, (iv) otherwish

(c) (i) build, (ii) built, (iii) builds, (iv) building

(d) (i) then, (ii) than, (iii) by, (iv) to

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