Can you imagine that a smart man like him ___________ make such a stupid mistake?
You can’t avoid _____ your job tomorrow ______ you work hard today.
After two years’ research, we now have a _______ better understanding of the disease.
Can you imagine the great difficulty he had ________ his driving test last week?
I was deeply impressed ________ the speech by the mayor of Shanghai before the final voting for EXPO 2010.
The meeting began two hours ago and because no decision _______, we will continue our discussion tomorrow.