Question

Fill in the blanks : Passenger air planes mostly fly (a) _______ speeds less than that (b) _______ sound. Air planes (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.

Answer 1

Answer:

1. at

2.of

3.that

4.at

4.because

5.at

6.than

7.the

Answer 2

1.at

2.of

3.that

4.at

5.because

6.at

7.at

8.than

9.the