The most important thing about cotton in history is ______part that it played in _______Industrial Revolution.
The article suggests that when a person ____________ under unusual stress he should be especially careful to have a well-balanced diet.
—How are things going? —The disabled ________ no relatives in Guangzhou ________ by the volunteers, who will graduate from Zhongshan University next year.
He traveled to many mountain villages and saw many poor children out of school. This experience ___________ his life.
I should very much like to have gone to the party but I _________.
My dictionary _________, I have looked for it everywhere but still ________ it.