1 . Cloning has always been with us and is here to stay. It is a way of making     1     exact copy of another animal or plant. Cloning plants is straightforward while cloning animals is very complicated. The process of cloning is a difficult task     2    (undertake) Many attempts to clone mammals failed. But finally the determination and patience of the scientists paid     3     in 1996 with a breakthrough-the cloning of Dolly the sheep.

At first the fact     4     she seemed to develop normally was very encouraging. Then came the     5    (disturb) news that Dolly had become seriously ill, which made cloning scientists cast down. Meanwhile, Dolly’s appearance raised a storm of     6    (object) and had a great impact on the media and public imagination.     7    (apparent) it became controversial. Although at present human egg cells and embryos     8    (need)for cloning research are hard to obtain, newspapers wrote of evil leaders     9    (hope) to clone themselves to attain their ambitions. Religious leaders also raised moral questions. Some countries reformed their legal systems and     10    (forbid) research into human cloning, but others like China and the UK, continued to accumulate evidence of the abundant medical aid that cloning could provide.