--- Excuse me, would you mind answering a few questions? --- Well, I don’t know. I’m in rather a hurry_____.
Upon ______the classroom, I started thinking about my mother.
Although it had been________ struggle for him to finish______ experiment, he enjoyed the result with________ satisfaction.
The map is one of the best tools a man has ________ he goes to a new place.
It is reported that the local police ________ the case of two missing children, but no much progress has been made up to now.
— I went to the live concert yesterday and didn’t know what happened in the school.— ____________ .