_____ his knowledge of the mountainous country, John Smith was appointed as our guide.
—Do you mind if I smoke here? — ___________.
It’s not _________ good idea to drive for four hours without _______ break.
---How about putting some pictures into the report? ---________ A picture is worth a thousand words.
One minute she burst into ________ and the next burst out ________. We just couldn’t catch her mood at any moment.
We all agree that the products of this factory are of better ________.