12. Most American cities are relatively small _____ population when compared with Shanghai and Beijing.

Everyone present at the party thought his jokes were _____, so none of them laughed.

17. The new outline will throw light _______ students’ understanding of history.

The pilot, whether ______ or design, made the plane do a sharp turn beautifully.

The man who thought of ______a gas engine _____ wheels was the inventor of the automobiles.

The company was named Gates Hall ______ a man named James Gates.

5．______the lack of a recent title, Ding Junhui can take comfort in knowing he has inspired a new generation of Chinese players.

Friends and relatives of the young couple have come to congratulate them _______ the arrival of the new baby.

Tom is keen _____ surfing the Internet in his spare time.

She missed the plane, _____ driving very fast to the airport.