Mr Smith is ____ European and his wife is ____ American.
A. an, an
B. a, a
C. a, an
D. an, a
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Lesson 10 is ____ most difficult lesson, but it isn’t ____ most difficult lesson in Book One.
A. a, a
B. a, the
C. the, the
D. the, a
My sister works in a factory. She goes home once ____ month.
A. a
B. an
C. the
D. every
He was absent because he had caught ____.
A. heavy a cold
B. the heavy cold
C. a heavy cold
D. heavy cold
____ water is ____ liquid.
A. The, a
B. A, a
C. /, /
D. /, a