He was watching her doing it with a ________ look on her face, as if to say that she would not change her mind.

The survey ____ in our school last monthshows that about three percent of the students are addicted to the Internetgames.

Since we are not wealthy now，we’d better take our dailyexpenses into________.

It was along the Mississippi River _______ Mark Twain spent much of his childhood.

When travelling in buses or trains,we are likely to have conversations _____ we give information or opinions about different things