There have been some insensible people who attempt to end their pains () through suicide.

单项选择题The crisis over parliamentary election illustrated the unpredictable () that events could take once the coalition troops are withdrawn.

A. process
B. line
C. way
D. course

单项选择题Decades of () might have been partially responsible for our ignorance of development abroad.

A. insulation
B. irrigation
C. integration
D. isolation