—What’s ______ most useful invention in the 20th century? —______ computer, I think.
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A
the, A
B
a, A
C
the, The
D
/, The
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There is ________ invitation on the desk. _______ invitation is from Lucy.
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an; An
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the; An
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—Could you pass me _____glass on the table please? —Sure, but it’s _____empty one.
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A
the, an
B
the ,the
C
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D
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