(2013·高考湖南卷)Not once________to Michael that he could one day become a top student in his class.

27．—Mary, you didn’t show up at the meeting last week? —No, I________, but my son had a sudden fever and I had to stay at home to take care of him

How nice! I just wonder_______.

Mr Wang’s lessons are _____, so his students like him very much.

Most Americans would prefer to keep their problems_______ themselves and solve their problems_______ themselves.