Governments today play an increasingly larger role in the （）of welfare, economics, and education.

单项选择题I would never have （） a court of law if I hadn't been so desperate.

A. sought for
B. accounted for
C. turned up
D. resorted to

单项选择题We must（） that the experiment is gong to be controlled as rigidly as possible.

A. assure
B. secure
C. ensure
D. endure