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21. ?? Leonardo DiCaprio is________ famous actor.

 ?? Yes, he performs very well in________ film ??The Revenant??.

A. a;,/                   B. a; the                C. the; the             D. the; /

22. ?? I want to buy the book "Cold Mountain". Do you know its _______ .

   ?? Not really. Maybe three dollars.

    A. cover                B. size                   C. color                 D. price

23. The young lady ______ we met yesterday is our new math teacher.

    A. what                 B. whose               C. who                  D. which

24. ?? Professor Wang is so strict in the project because we can??t afford to make any mistakes.

 ?? I know. We??ll check it again _____ we??ve checked several times.