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Doctors in the USA have transplanted a pig's heart [onto / into] a man. It is the first time this has [happening / happened] . The doctors are from the University of Maryland Medical Center. They say David Bennett, 57, is doing [well / good] after his operation. Mr Bennett was very [illness / ill] . The doctors said giving him the pig's heart was the only [chance / change] of keeping him alive. Bennett spoke [for / to] doctors the day before the operation. He said: "It was [either / neither] die or do this transplant. I want to live. I know it's a shot in the [light / dark] , but it's my last choice." The pig's heart came from a genetically-modified pig. Scientists changed the [jeans / genes] of the pig so its heart would be more [suitable / suits] for a transplant into a human.

The transplant operation [gave / took] seven hours. Doctors received special permission from U.S. authorities for the experimental [sugary / surgery] . Without it, Mr Bennett would have [died / dead] . Scientists have been researching pig-organ transplants [for / four] years. They believe Mr Bennett's transplant means more transplants could take place [on / in] the future. They said this could bring the [word / world] , "one step closer to [solving / solve] the organ shortage crisis". Surgeon Dr Bartley Griffith said: "We are also [optimism / optimistic] that this first-in-the-world surgery will provide an important new [adoption / option] for patients in the future." Mr Bennett hopes his transplant will allow him to live longer. He said: "I look [forwarding / forward] to getting out of bed after I recover."