单项选择题

In our own galaxy, the Milky Way, there are perhaps 200 billion stars,a small part of themprobably have planets on which life is feasible（）.

A．a small fraction in which
B．a small fraction of which
C．a small fraction which
D．which a fraction of

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单项选择题
All don't have a free ticket must pay the admission fee（）.

A．Everyone who doesn't have a free ticket
B．No one who doesn't have a free ticket
C．No one who has free tickets
D．Anyone who has free tickets
单项选择题
The professor is quite difficult pleased（）.

A．to please
B．to be pleased
C．for pleasing
D．pleasing
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