__________ are my sisters．This is Alice，and this is Lily．

Excuse me, does Mr. Zhang’s son live here? —He________ be here, but he has moved?

______are good friends.

Must I stay here with you?– No, you ______. You may go home, but you _____ go to the net bar(网吧).

I’d like to introduce my best friend to you , Peter .—- Thank you , Lucy . But we __________already .