He was thinking about the problem when an apple fell off the tree, _______ him right on the head.
Freddy made up his mind to enjoy his singing and to________ as many happy experiences as he could.
The Chinese government has overcome problems of population and economy to ________ its “nine years of compulsory education”.
—How did you find the film The Flowers of War? —It's very moving. I couldn't ________ my tears.
If the time is ________ exactly, the paper can be finished on time.
While college graduates ________ a lack of available jobs, factories are facing difficulties in hiring workers.