— Sit down，please.
— ________.

----- Sit down please.----- ____________.

--Sit down, please. --       .

A. Thank you.             B. Good morning.     C. Hello.   D. Goodbye

— Sit down，please.

— ________.

A．Yes              B．No               C．Fine              D．Thank you

----- Sit down please.----- ____________.