．Life is too short to waste and too ________ to give up.

The knowledge that I had caused him to lose his job made me bitterly ______.

A survey says what parents say and do in daily life usually has a(n) ______ influence on their child.

In those days, our ________ concern was to provide people who were stopped by the snow storm with food and health care.

Our country are working even harder now to _______ the gap between the developed countries and ours.