When I met him the other day, it was the first time we ____ each other since we were at school.
The main cause of HIV / AIDS infection in China is drug abuse, ______ is very serious in Yunnan.
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.
11.We should consider the students’ request the school library provide more books on popular science.