Do it now. __________, it will be too late.
Could you tell me if Bob__________ the party? If he __________ , please tell me .
I don’t know when he_____________; when he__________, I’ll tell you.
--- Hello, Jack! How are you doing? --- _________.
--- _________ David be the new chairperson of the Students’ Union? --- He ________ be, but I’m not sure.
--- Liu Tao has never read the book The Adventure of Tom Sawyer , _________ he?--- _________. He told me it's very interesting. He'd like to read it again.