. _____ with letters and public phones, mobile phones and the Internet are faster and much more convenient.
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.
The _____, I think, he drew from his simple experiment is not scientific.
13. Unsatisfied with the payment, he took the job just to got some work experience. A. though was he B, though he was C. he was though D. was he though