We can take escalator to go upstairs in this supermarket. （  ）

A．a

B．the

C．/

D．an

选词填空。
【小题1】_________ ( Do / Does ) you have a playground?
【小题2】We have ________ ( a / an)art room.
【小题3】It’s ________ ( to / on )the second floor.
【小题4】The teachers’ office is next ________ ( to / on ) our classroom.
【小题5】Look! This ________ ( is / are ) our new classroom.

Look! ______ red dog. （   ）

A．A

B．An

C．Am

There is ______ aviary in the park. There are many kinds of birds in ______ aviary. ( )

A．a, the

B．an, an

C．an, the

It's________orange dog.(  )

A．a

B．an