()是运用老年学的相关知识，以老年人及其相关人员和系统为工作对象，帮助老年人，特别是处境困难的老年人，改善社会功能，提高生活质量，使老年人有更好的社会适应和福祉。
It is imperative that students _____ their term papers on time.
He noticed the helicopter hovering over the field. Then to his astonishment, he saw a rope ladder _____ out and three men climbing down it.
She asked that she _____ allowed to see her son in police custody.
Nowhere but in the remotest region of the country ____find a place to settle down.
—Are you hungry now?
—_______. I have just had two bowls of rice.
What a nice day! How about the three of us _____ a walk in the park nearby.
Many artists predict that this brilliant young actor __ to be a shinning star.
_____enough time and money, the researchers would have been able to discover more in this field.
Bread and butter____liked by Westerners.
I was to have made a speech if _____.