题目内容：

    Astronauts are people who go out into space. Being an astronaut is an exciting job. While in space, astronauts can look down and see 1.（cloud）, land, and water. They can even see the moon up close. Astronauts get the chance 2.(see) more stars than you or I have ever seen. Being an astronaut may be exciting, 3. it is not an easy job. A person who 4.(want) to be an astronaut has to study for years. There are many things an astronaut must learn to do before going into space.