In the 21st century, all nations must take their ________of responsibility for the global safety.

Nowadays some protective parents want to      their kids from every kind of danger, real or imagined.

Too much pressure from study leads to sleeplessness, which _______ increases the risk of forgetfulness.

You are no longer a child. It’s time for you to _______ differences with your parents.

We should try our best to ______ those people after the disaster.