It took a great deal of courage to admit that all his efforts had been ____.
--- Mary didn’t attend the lecture, did she? --- Yes, she ________.
--- Will you waste your time and money on that? --- Certainly ________.
Although ________ to stop, he kept on working.
He said _____ his sister had passed the college entrance examination, and _____ she would go to college in about 20 days.
We will have a meeting next week, but we don’t know _____.