--- Sit down, please!         

---                   .

A. Hello.    B. You sit down.    C. Thank you!    D. OK.

--- Sit down, please! 

---                   .

1. A.
   Hello.
2. B.
   You sit down.
3. C.
   Thank you!
4. D.
   OK.

--- Sit down, please!         
---                   .