10. Mr. White was so angry at all______Bill was doing________he walked out.
He is so busy with the research _____ he has no time left for any other activity.
It was going to be some time _____ he would see his father again.
She does not know _____ the situation, for she is too inexperienced.
The reason ____he was late was ____he had taken a wrong bus.
—Do you know what the letters MBA _____? —Sorry, I don’t know.