It is obvious to the students ______ they should get well prepared for their future.
I just wonder _______that upsets him so much.
—Why do you look so worried? —My computer broke down and my essay ______ unfinished since.
If you sit near front of the coach, you’ll have better view.
—Why was Mr. Liu thundering in the classroom yesterday?— A student’s interrupting his speech _____the burst of his anger.
Tommy, you____ be hooked on the Internet all day. You may fall behind others in study.