21. —– unit means a measurement
A. a
B. an
C. no article
D. the
23. Taj mahal is built of —– marble
A. a
B. an
C. the
D. no article
24. He is —– European
A. an
B. a
C. no article
D. the
25. Let us play —– chess
A. no article
B. a
C. an
D. the
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