-Is this a ruler?

-________. It's a pencil.

1. A.
   Yes, I am
2. B.
   Yes, it is
3. C.
   No, it isn't
4. D.
   No, I'm not

 — Is this a key?   — ________ .

A. No, it isn’t.     B. It’s a ruler      C. Yes, it’s           D. OK

---- Is this a key?

   ---- ________ .

A. No, it isn’t.         B. It’s a ruler              C. Yes, it’s                  D. OK

---- Is this a key?

---- ________ .

A. No, it isn’t.　　　　 B. It’s a ruler　　　　 C. Yes, it’s　　　　　　　　　 D. OK