ĐIỀN MỘT TỪ THÍCH HỢP NHẤT: Space exploration costs a lot of money. Is it really necessary? Up to now, very few astronaunts have had chances to visit space. ............................. space research has benefited humans in many ways. Satellites in space send information to............ the dailly weather. Communications satellities mean easy ans instant contact........two people from afar. During the space trips, scientists can.........more about human bodies. Some scientists even..........of finding new homes for mankind on another planet.