Dina, （）for months to find a job as a waitress, finally took a position at a local advertising agency.

单项选择题Now everyone is concerned about how to conquer the economic crisis（）is very important for us to be able to preserve our standard of living.

A. which success
B. its success
C. the success of which
D. the success of it

单项选择题Every means（）tried but without any result．

A．have been
B．is to be
C．are to be
D．has been