Who ________ the door?
( )—Excuse me, Jack. Where is the bus? —___________.
( )
( )—What is thirty and twelve? —It’ s ___________.
( )—__________your brother here? —__________,he isn’ t here.
( )—__________the bike? —Look! It’ s under the tree.
( )Jim and I__________ students. We__________in the same class.