Not until I dropped off from school ____ how much time I had wasted.
A. didn't I realize B. did I realize
C. I didn't realize D. I realized
----Why don’t you ______ to a more sensible method?
----Well, I’m thinking about it.
A. switch on B. switch off
C. switch over D. switch through
—May I watch TV for another 15 minutes, Mum?
—Oh, dear, if you _____.
A. can B. must C. may D. should
The entire hall burst into a great cheer and applause _______ the Nobel Prize winner appeared on the stage accompanied by the chairman.
A. until B. while C. by the time D. the moment
John has determined to _______ teaching in the quake-hit area when he graduates from university.
A. pick up B. set up C. take up D. give up
------You’ve left the light on.
------Oh, so I have. _____________to turn it off.
A. I’ll go B. I’ve gone C. I go D. I’m going
