Annoyed by the salesman's bad manners, John chose       of the two computers on sale and left．

---Tom has been fired by his boss．

---              ? As far as I know, he is a hardworking and considerate fellow．

I was chatting on the Internet last night when I smelt something   in the next room．

The policeman scolded the driver for turning without a           ．

--- Tony, you must have noticed the student who broke the glass．

--- I'm sorry．I           attentively．

--- Have you heard that George quit his job?

---Yeah, but I can't             why he did so．

Professor Tang didn't give us a speech today．It was        he had a traffic accident on the way to school．

I       the office yesterday afternoon when a stranger came in with a boy．

--- Hi, Lucy．Do you know where Linda is?

--- She           in the library．I saw her there just a few minutes ago．

Li Gang was required to apologize       the people present at the meeting __ what he had done．