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Among all the fast growing science and technology, the research of human genes, ___ biological engineering as people call it, is drawing more and more attention now. Sometimes it is a hot topic ____ (discuss) by people.
The greatest thing that gene technology can do is to cure serious diseases that doctors at present can almost do nothing with, such as cancer and heart disease. Every year, millions of people are murdered by these two ____ (kill). And to date, doctors have not found ___ effective way to cure them. But if the gene technology ____ (apply) , not only these two diseases can be cured completely, _ __ (bring)  happiness and more living days to the patients, but also the great amount of money people spent on curing their diseases can be saved, so ____ benefits the economy as well. In addition, human life span(寿命) can be prolonged.
Gene technology can help people to give birth to more healthy and clever children. Some families, with the English imperial(皇室) family being a good example, have hereditary diseases. This means their children will for sure have the family disease, ____ is a great trouble for these families. In the past, doctors could do nothing about hereditary diseases, ____ gene technology can solve this problem ____ (perfect). The scientist just needs to find the wrong gene and correct it, and a healthy child will be born.