What a fast learner he was! He_____ a lot of French when he lived with the native.
According to the psychoanalyst Sigmund Freud, wisdom comes from the _____ of maturity.
This is the _____ piano on which the composer created some of his greatest works.
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.