Listen to the following recording, then fill in the blanks with the words you hear. Have you ever been gazing at a 1) _______ sky when suddenly a bright dot glided into view? If it wasn't blinking, then you've had the distinct pleasure of seeing one of mankind's greatest collaborative feats with your own eyes: The International Space Station. Roughly the size of six-bedroom house and 2) _______ more than 320 cars, the International Space Station is so large that no single rocket could have lifted it into orbit. Instead, it was assembled piece by piece while hurtling through space at 28,000 kilometers per hour, lapping the Earth once every 90 minutes. It all started when sixteen nations 3) _______ the Space Station Intergovernmental Agreement, laying out each partner's expected contributions to the ISS, from modules and maintenance to sharing information and finances. At an 4) _______ 100 billion U.S. dollars, the Space Station would be the most expensive object ever built. It took ten years and over 30 5) _______, but finally, the International Space Station was complete, coinciding with the U.S. Space Shuttle Program's 6) _______. The Space Station continues to serve as an incredible model for international 7) ________. This year, two people began a one-year stay on the ISS, allowing scientists to study the 8) _______ physical and psychological effects of being in space, which would prove useful for increasingly ambitious space travel, like trips to Mars. Over its 9) _______, we've learned an immense amount scientifically, but also about our capacity to work together and 10) _______ truly remarkable acts.