________ scores of times, but he still couldn't understand it.
After describing the planned improvements, she went on _______ how much they would cost.
The film star walked to his car, ______ a crowd of journalists.
_______ on time, this medicine will be quite effective.
When I handed the report to John, he said that George was the person _______.
He is a man of few words, and seldom speaks until _______ to.