The astronauts could not have reached the moon without the invention of rockets. We live in the age of rockets, but do you know that rockets are not a modern
(1) _____ ? For centuries, rockets were used to entertain people. The Chinese used
rockets (2) ______ fireworks. In the 13th century, rockets were first used in war. The
Mongols used rockets to attack a Chinese city in 1232. These early rockets could not
(3) ________very far. However, in 1885 a Russian scientist discovered a better fuel for rockets. This liquid fuel gave rockets much more power. Then in 1919 a new age of rockets began. In that year an American scientist, Robert Goddard, said that it was
(4 )______ to send a rocket to the moon! Goddard launched his first liquid-fuelled rocket
in 1923. It flew 184 feet. Almost 12 years later, he sent a rocket 7,500 feet into the
air in 1935. Russian rockets sent the first (5) ______ into orbit in 1957. Just 12 years
later the first man walked on the moon – thanks to rockets! Where will rockets take us next?
The astronauts could not have reached the moon without the invention of rockets. We live in the age of rockets, but do you know that rockets are not a modern
(1) __invention___ ? For centuries, rockets were used to entertain people. The Chinese used
rockets (2) __as__a__ fireworks. In the 13th century, rockets were first used in war. The
Mongols used rockets to attack a Chinese city in 1232. These early rockets could not
(3) ___fly_____very far. However, in 1885 a Russian scientist discovered a better fuel for rockets. This liquid fuel gave rockets much more power. Then in 1919 a new age of rockets began. In that year an American scientist, Robert Goddard, said that it was
(4 )___used___ to send a rocket to the moon! Goddard launched his first liquid-fuelled rocket in 1923. It flew 184 feet. Almost 12 years later, he sent a rocket 7,500 feet into the
air in 1935. Russian rockets sent the first (5) _flight_____ into orbit in 1957. Just 12 years
later the first man walked on the moon – thanks to rockets! Where will rockets take us next?
cs sai thì bạn ns để mình sửa nhé
1. invention
2. as
3. fly
4. used
5. flight