---What is your mother doing? --- _________cooking dinner. A.she is B.He is C.She is
( )The Huanghe River is five thousand metres _______ .
( )The classroom is ten years ______ .
( )Please tell me _____ the Great Wall .
( )Liming is in New York ______ his cousin. A. at B. with C. for
( ) Do you want ____ swimming. A. go B. going C. to go