Six days of spring rain had created a wild river ____(run) by Nancy Brown’s farm．As she tried to drive her cows to higher ground, she ______(slip) and hit her head on a fallen tree trunk．Nancy was badly hurt and could only walk with great ____(difficult）．The water _____(rise)．Nancy’s pace got slower and slower．Finally, all she could do was to throw her arm around Lizzie’s neck and try to hang on．About 20 minutes later, Lizzie managed to ____ (succeed) pull herself and Nancy out of the water and onto a bit of high land．
It took rescuers another two hours to discover Nancy．____ helicopter lowered a doctor, ______attached Nancy to a life-support lift．They raised her into the helicopter and took her to the school gym, _____the Red Cross had set up an emergency shelter．
When the flood subsided two days later, Nancy immediately went back to the highland．Lizzie was gone.  ______was one of the 19 cows that Nancy lost．“I owe my life ____her,” said Nancy sobbingly．