________ is know to us all is that the old worker, for _______ life was hard in the past, still works hard in his seventies.
I really appreciate __________ to help me out.
—I have to cut the expenses to meet the daily needs. —So do I, for the prices of goods _________ going up these days.
Professor Wu keeps __________ his students that the future __________ to the well-educated.
Being afraid of making mistakes, the little boy __________ answer his teacher's questions.
The president was so absorbed in his work that not a sound __________.