The time he has devoted in the past years _______ the disabled is now considered to be _______ great value _______ him.
Lei Feng ______ for many years, but his spirit is still encouraging us.
The final exam is very important. We must treat it _______.
---- Have you heard of the song Little Apple? ---- Yes. It ______ every morning when aged people do square dancing downstairs.
We advise parents _____ their children at home alone in order to keep them away from danger.
---- So far, Su Binglan is the only Chinese who finished the 100-meter race in less than 10 seconds. ----- ______ he runs!