---Can you work out the maths problem? ---Sorry, I can ______ understand its meaning.
Did you know ______?
The number of people invited _____fifty, but a number of them ______ absent (缺席) for different reasons.
Mr. Wang was ______ because he was late for work. He is out of work now.
—Must we go there together at once? —______ you ______ he goes there, only one student is needed.
My ______ sister who works in the bank is two years ______ than I.