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Can those ____ at the back of the classroom hear me?

No problem.

A. seat          B. sit         C. seated         D. sat

------Can those_____ at the back of the classroom hear me?

------- No problem.

A. seat    B. sitted    C. seated   D. sat

 –Can those           at the back of the classroom hear me?

    -- No problem.

    A. seat         B. sit          C.seated            D. sat