单选题
It was wonderful up there. Ralph wanted to reach out and touch a star, for they looked so close. He could see the earth【C1】______ smaller and smaller. The ship circled around a made star called Mars, and his space friends【C2】______ Ralph understand that this was their home. He wanted to ask all kinds of【C3】______, but no one could answer him. There was nothing to eat or drink. There people had only a few colourful pills which they can eat【C4】______ they were hungry. Soon it became even harder for Ralph【C5】______ than he felt at first. He felt so light that he could not even stand【C6】______ his own feet. "If I could only have some water," he wished, "and a ride back down to the earth!" The spacemen knew that it was【C7】______ for Ralph to leave. He could not live up there any longer without special air or suit like【C8】______ So they took him to a part of the ship【C9】______ room enough for just one man. A door closed over his head and in a minute Ralph 【C10】______ down to the earth in his own rocket ship. Suddenly he felt the rocket slow down and then stopped. He was back on the earth.