完型填空

　　A girl named Xiaoxiao was ill in hospital because of uremia(尿毒症)．Only her mute(哑)brother came to 　　1　　 her company．The girl was 　　2　　 by her brother since their parents died when the girl was only 4 years old．They had 　　3　　 all their money, and life was hard for them．But the brother wouldn't 　　4　　 his sister die young．So he made a wooden handcart and took his sister to a 　　5　　 provincial hospital．

　　The doctors were 　　6　　 by the brother and the sister's close relationship and experiences, so the hospital decided to have a kidney(肾)transplantation operation for the girl, completely free of charge．Naturally her brother would 　　7　　 one of his kidneys．The doctors examined the 　　8　　 to see if his kidney could match his sister's．Everything went well and the 　　9　　 time was fixed．

　　A doctor asked the brother to come to his 　　10　　,and told him with gestures that they would transplant one of his kidneys to his sister．　　11　　 smile froze on his face．The doctor 　　12　　 to him that if his kidney was transplanted successfully, his sister would be 　　13　　; otherwise, she would die．

　　The mute brother 　　14　　 for one minute and nodded to the doctor seriously．　　15　　 to everyone's surprise, the brother disappeared that afternoon．The doctor asked Xiaoxiao what her brother told her before 　　16　　．Her answer was that he had to go home for some reasons．

　　That made the doctors 　　17　　 a lot．Then just before the operation, someone rushed to Xiaoxiao－it was her mute brother, saying something excitedly with gestures．Then, Xiaoxiao burst into 　　18　　．She told me doctors that her brother had gone back to plant corns in 　　19　　 fields and prepared firewood for her．Because he thought he would die after transplanting his kidney to his sister and would not be able to 　　20　　 her any longer．