询问别人这是谁的短裤时,你应该说:______A.Whose pants are these? B. Whose pants is it?
( )Is this your sister? A.No, he isn’t B. Yes, She is.
( )He’s my sister. That’s ______book. A.his B. her
( )_______ is that girl? She is my sister. A.Who B. How
( )This’s my ______ A.father B. mother
( )Look ______this picture.. A.at B. in