About three hundred years ago in Italy, there lived a young man whose name was Galileo. He was always thinking and always asking the reasons for things.
One evening when he was only eighteen years old he was in the cathedral at Pisa at about the time the lamps were lighted. From the (47)________lamps were hung by long rods. (48)________ the lamplighter knocked against them, or the wind blew through the (49)______ they would swing back and forth like pendulums. Galileo noticed this, then he began to study them more closely. As Galileo watched them swinging to and fro he became much (50)______.
When he went to his room he began to (51)______ He took a number of cords of different (52)______ and hung them from the ceiling. To the free end of each cord he fastened a weight. Then he set all to swinging back and forth, like the (53)______ in the cathedral. Each cord was a pendulum, just as each rod had been.
(54)______, to the swinging lamps in the cathedral, and to Galileo’’s habits of thinking and inquiring, the world (55)______ one of the commonest and most (56)______ inventions—the pendulum clock.
WORD BANK
A) lamps B) cinema C) owes
D) When E) Although F) cathedral
G) experiment H) practice I) useful
J) ceiling K) interested L) Thus
M) lengths N) heights O) lambs