题目

   No one knows what would happen in the future for sure. But we often     41    the future and wonder     42     the world would be like in the future.   Think of space. Perhaps a permanent station on the moon will have been    43   . Perhaps people will be able to visit the moon as     44   . Cheap rockets for     45     travel will have been developed, permitting long     46    throughout the solar system. When that time comes, people will be     47    holidays in space and visiting other planets,     48    the Mars and the Venus加偏旁，变新字，并组词。爱 ——、 分——、