I. 单项填空：（共10小题，每题1分，满分10分）
1．_____Obama was elected _____president of the U.S.A. is _____success for the black in America.
A. That ; /; a B. That; the ; a C./; the; a D. / ; / ;a
2. I just don’t understand _____that leads to so many teenagers becoming addicted to playing computer games.
A. why it does B. what it does C. what it is D. why it is
3. What shall we do when all the oil in the world has been _____?
A. made up B. put up C .held up D .used up
4. In front of the candy shop ______.
A. where stood a huge poster B. did a huge poster appear
C. stood there a huge poster D. appeared a huge poster
5. If the food tastes nice, we will buy some. If _____, _____.
A. no; no B .not; not C .not; no D. no; not
6._______made him worried.
A. Not knowing how to do B .Unknown what to do
