根据上下文,在每个空格处填入一个适当的单词,使文章意思通顺、前后连贯、结构完整。
Nowadays, with the development of science and technology, cloning has become a hot topic for many people. Some people are against it ,while others are in favour      it. Personally, I wouldlike to say that cloning is good   the human race.
   , cloning technology proves helpful for genetics researchers. With cloning technology, scientists    bring some animals that are extinct back to life. Secondly, cloning body parts can serve as a lifesaver for people       are seriously ill. When a body organ such as a kidney or heart fails to function, it may be possible to replace it      a cloned one. Thirdly, if a couple can’t have     child, human cloning technology will make it possible for them to have a child. All in all, I firmly believe that cloning is beneficial   the human race.