Where is the canteen? It’s ______ first floor.A. in B. at C. on
( ) What _____your mother do? A. do B. does C. is
( )Let me introduce my parents ____you. A. onB. toC. with
( )I want_______ a policeman? A. toB. to do C. to be
( ) My uncle is _____ actor. A. a B. an C. the
( )—___________he? —He’s my father. A. Who’s B. What’s C. Who