---Is there anything I can do for you? ---I’m looking for a book,      written by Han Han.

 Have you any knives？ I need a sharp ________.

I didn’t have _____ to say, so I said _____. 

—Which tie would you prefer，the black tie or the red one，Madam?—I’ll take ________ to have a change sometimes.

—He must be busy doing his homework right now.　　—I imagine____.