Answers:
1 >> Nowadays our lives have been much improved by the progresses made in science and technology.

2 >> I want to become an astronaut so that I will be able to travel faster than sound

3 >> Sally Ride was one of the five astronauts on the space shuttle Challenger, which completed a successful six-day voyage in space.

4 >> Neil Armstrong, a famous American astronaut, is known as the first person to walk on the moon.

5 >> On July 20th 1969 two Americans landed on the moon in the spaceship named Apollo.

6 >> Yuri Gagarin was the first man to travel in space.

7 >>  Yuri Gagarin could have made another space flight if a tragic accident had not occurred.

8 >> China became the third country in the world to be able to independently carry out manned space flights.