I ___________ in the street when I met an old friend of mine yesterday.
The twin towers fell down. It looked_____ a huge piece of chocolate had been melted down(溶化).
The money is to be used________the poor.
The traditional view is _______ we sleep because our brain is “programmed” to make us do so.
_______ the influence of computers, nowhere have we seen the results more clearly than in the US.
He suggested the problem worth paying attention_____ at the meeting.