One method of terraforming Mars would be to (11) ____ asteroids at the planet. Rockets attached to enormous asteroid would propel it towards Mars, taking ten years to(12) ____ the enormous distances required. The asteroid would (13) ____ the planet with incredible force and (14)____ enough energy to (15) ____ the planet’s temperature. The result would be a temperate climate and lots of water from melting ice caps A-cover B-create C-hit D-increase E-land F-drive G-power H-rise I-shoot

11. shoot
12. drive
13. hit
14. create
15. increase