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Which rules of using ‘A/An’ is correct?
A. A/An is used with unique nouns.
B. A/An is used to show job, status.
C. A/An is used with musical instruments.
D. A/An is used before morning, afternoon, evening, night.

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A. was able to speak
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He must be about 90. He is really ___.
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HYDRATION
A. TO BEGIN OR PUT INTO PRACTICE
B. AMOUNT OF SPACE OCCUPIED BY A FLUID
C. MAINTENANCE OF BODY FLUID BALANCE