We thought there were 35 students in the dining hall, ______, in fact, there were 40.
He was deep in thought with his eyes_____ on the ceiling.
The car was completely _____ and the driver seriously injured.
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
______run fast should take part in the 400-meter race tomorrow.
Was it in the factory_____ you worked five years ago___ you learned the technique?