C. formation
D. power
正确的答案是:C
11.A. with
B. as
C. form
D. beside
正确的答案是:B
12.A. turned
B. worked
C. led
D. attempted
正确的答案是:C
13.A. unknow
B. interesting
C. different
D. visible
正确的答案是:A
14.A. form
B. outcome
C. effect
D. source
正确的答案是:C
15.A. seized
B. proven
C. caught
D. grasped
正确的答案是:B