1. A. Due to using
B. Trying to use
C. Without using
D. While using
2. A. to find
B. for searching
C. to be searching
D. which can be searching
3. A. use them seriously
B. used them for pleasure
C. refuse to use them
D. always try to use them
4. A. a university has chosen them
B. they won’t continue to study at all
C. they have never played it before
D. they had a university to study