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1. _____ milk is food. ______ milk in this cup has gone bad.
2. — Do you like playing ______ football? 
    — Yes. But I have only ______ basketball.
3. Do you know ______ girl on ______ another side of _____ lake?
4. There's ______ "u" and ______ "s" in ______ work "use".
5. She says ______ animals cant's live without ______ air, either.

A. an; an
B. a; an
C. a; a
D. an; a

A. an; a
B. an; an
C. a; a    
D. a; an