___herself wondering whether she had made a mistake, she felt embarrassed and at a loss.
9.With the world changing fast, we have something new with all by ourselves every day.
10. Professor Williams keeps telling his students that the future to the well-educated.
The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
11.We should consider the students’ request the school library provide more books on popular science.
12. ---Hi, Tom. Any idea where Jane is? ---She in the classroom. I saw her there just now.