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The woman keeps _______ the house because she wants to keep it _______.

A. cleaning; clean B. to clean; clean

C. clean; cleaning D. cleaning; cleaning

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Life is full of surprises and you never know how things will turn out .Sir John Gurdon is a good example of this. As a boy, he was told he was hopeless at science and finished bottom of his class. Now, aged 79, the very same Gurdon shared the 2012 Nobe Prize in Medicine with Japanese stem cell(干细胞) researcher Shinya Yamanaka.

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“My own belief is that we will, in the end, understand everything about how cells actually work,” Gurdon said.

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