题目

Carmen’s mother Maria had just survived a serious heart attack. But without a heart transplant her life was in constant   36     .         Both the mother and daughter knew that the chances were very small: finding a donor heart that   37      Maria’s blood type could take years. However, Carmen was determined to save her mother. She kept   38    hospitals all over the country.        Days stretched out. By Christmas, Maria had trouble   39  from one end of the room to the other. Carmen lost all hope. She fell into a corner of the hospital, crying. “A1. Several countries have sent up spaceships.The spaceships mainly use electronic controls.(将两句合成一句）Several countries have sent up spaceships______ mainly use electronic controls.