题目内容：

Listen to the passage and complete the sentences（听短文，完成下列内容，每空格限填一词）：

1.Spaceship One was chosen as the ________ ________ of the year.

2.Lots of people want to travel ________ ________, but it’s too expensive.

3.Dennis Tito was the first ________ ________ to visit the International Space Station.

4.In the next 10 to 15 years, you could ________ ________ above the earth if you pay $20,000 to $100,000.