--Has Billy finished his homework today?
--I have no idea. He ______ it this morning.
A. would do B. was doing
C. has done D. had done
______ more and more people may turn to the Internet for the latest news, it is unlikely that the newspaper will disappear．
A．When B. Because C. Since D. While
______ strong and powerful China will certainly benefit ______ whole world.
A. A; a B. The; a
C. The; the D. A; the
______ to smoking for a considerably long time, he has much difficulty quitting it.
A. Having been addicted B. Being addicted
C. To have been addicted D. Having addicted
Was it through Mary, ______ was working at a high school, ______ you got to know Tom?
A. who; who B. that; which
C. who; that D. who; which
The father, ready to retire at an early age, hoped that his eldest son would ______ the family business.
A. take over B. look into
C. take up D. look through
