精品一区二区免费在线观看_国产精品久久久久久av福利软件_97成人精品区在线播放_国内成人精品一区

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; a
B. an; an
C. a; a    
D. a; an

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