While we were running on the playground, Jack suddenly stopped and lay on the ground, so we all stoppedwhat was wrong with him. A. to run; to see B. running; seeing C. running; to see
I became a student ten years . I have been a student1996. I have studied here_____ about 10 years.
A. ago, since, for B. ago ,for ,since, C. ago, before, for D ago, in, after