The conference （）the possibility of establishing closer diplomatic relationship between the two countries.

单项选择题All the people （） treatment protested that the medical fee was too high to be acceptable

A. of
B. on
C. with
D. under

单项选择题The firm's promise to increase our pay was a reluctant （）to union demands, because the union would otherwise not go back to work.

A. response
B. reply
C. reaction
D. concession