[ Relative Clause ]
I have to learn new words. They are very difficult.
A. I have to learn new words that are very difficult.
B. I have to learn new words that they are very difficult.
C. I have to learn new words who are very difficult.
D. I have to learn new words whom are very difficult.

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Is there ________ university in this town?
A. a
B. an
C. the
D. –
E. as