-- What were you up to when she dropped in? -- I _____ for a while and _____ some reading.
She must be looking forward as much to his return as he himself is to _______ her.
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.