Mary’s uncle is doctor, her aunt is artist.A. a , a B. a, an C. an. a
( ) Stop at a _________ light. A. redB. yellowC. green
( ) An elephant is much _________ than a mouse. A. longer B. bigger C. smaller
( ) I know “cm” is _______.
( )—What school are you in? —I’m in _______.
( )—Do you have a dictionary? —_______