21. The discovery of new evidence led to _________.

A.     the thief having caught

B.      catch the thief

C.      the thief being caught

D.     the thief to be caught

22. It’s said that driving after drinking _________ thousands of traffic accidents every year.

A. results from   B. contributes to   C. devotes to    D. lies in

23. _________ more and more trees and grass planted, Zhengzhou looks much more beautiful now.

A. Since     B. With    C. As   D. For