Question

(1)Many ................... people know that sound travels at about 760 miles per hour. (2)With the invention of.....................(3) the speed of aeroplanes soon approached the speed of sound, and people began to ask what .........................
(4) happen when the so-called "sound-barrier" was crossed.In other words What Would happen to the ..................(5) and its pilot when an aircraft flew faster than sounds Some People said that The machine would fall to .................. and it would be impossible to make a machine that would fly faster than sound.

1.(A)illiterates
(B)eccentric
(C)educated
(D)no word needed

2.(A)aeroplanes
(B)eccentric
(C)jet aircraft
(D)rockets

3.(A)will
(B)would
(C)should
(D)shall

4.(A) aeroplane
(B)light
(C)sound
(D)machine

5.(A)pieces
(B)sea
(C)Earth
(D)no word
​

Answer 1

Answer:

1. No words needed.

2. Jet aircraft.

3. Will.

4. Aeroplane.

5. Earth.