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
—What do you think of __________ idea of taking part in ‘Earth Hour’?
—Wonderful! I’ve never heard of __________ one! We can reduce pollution in this way.