—Bob, where is Linda?—She          be in the library, but I am not sure.

—The research on the new flu virus vaccine is challenging and demanding. Who do you think can do the job?—________ my students have a try?

— Hello, may I speak to Mr. Wu? — I’m afraid he is not in now. ______ I take a message?

— It’s hard to believe that Jack ________ have fought with the policeman.— Yes. If one ________ ask for trouble, it can’t be helped.

 — When and where               we meet? — Let's make it 3:00 at my home.