当别人问你问题你不知道时,你应说:________A.Sorry.I don't know. B.OK. C.Great.
( ) _____ you visit me , we’ll play with the toys.
( )She is fourteen ______ old .
( )The Huanghe River is five thousand metres _______ .
( )The classroom is ten years ______ .
( )Please tell me _____ the Great Wall .