I think that's unlikely to happen, but if that ______ occur, both America's and China's interest would be severely damaged.

 Haven’t I told you already that you ___ have my answer tomorrow morning?

You ___ drink wine before driving, or the police will take your license away.

—The speaker is a tall man with glasses.—Then it         be Mr. Smith, who is short and thin.

 When Marx was in London, he  __   read at the library for hours.