Before the mid-20th century, most people felt travelling into space was an impossible dream. However, some scientists were d    1     to help humans realise their dream to explore space. After many experiments, they succeeded in making r    2    that could escape Earth’s gravity. On 4 October 1957, the Sputnik 1 satellite was l    3    by the USSR and successfully orbited around Earth. Afterwards, the USSR focused on sending people into space, and on 12 April 1961, Yuri Gagarin became the f    4    person in the world to go into space. Over eight years later, on 20 July1969, American astronaut Neil Armstrong stepped onto the moon, famously s    5    , “That’s one small step for [a] man, one giant leap for m    6    .” Following this, many more goals were achieved. For example, America’s NASA space-agency launched Voyager 1 on 5 September 1977 to study deep space, and it still t    7    data today.

Although scientists try to make sure nothing goes wrong, accidents can still happen. All the astronauts on the USSR’s Soyuz 11 and America’s Challenge died during their missions. These disasters made everyone sad and disappointed, but the desire to explore the universe never died. This is because people believe in the importance of c    8    on space exploration d    9     the huge risks. An example of this ongoing work is the International Space Station. It orbits Earth and has astronauts from different countries on b    10    , providing a continuous human presence in space.

Water had also appeared on other planets like Mars but    1    the earth, it had disappeared later. It was not immediately obvious that water was to be    2    to the development of life.

That afternoon aboard the train, the cousins    3    in their seats. Earlier that day, when they crossed the Rocky Mountains, they managed to    4    some mountain goats and even a grizzly bear and an eagle.

For forty years Jane Good all has been    5    about making the rest of the world understand and respect the life of these animals. She has argued that wild animals should be left in the wild and not used for    6    or advertisements.

Dr Yuan is quite    7    his life! However, he doesn't care about being famous. He feels it gives him less    8    to do his research. He would much rather keep time for his hobbies.

Then he    9    the lace of the shoe and eats it as if it were spaghetti. He eats each mouthful    10    .The acting is so convincing that it makes you believe that it is one of the best meals he has ever tasted.