1. He kept his head _____ water when he began to learn swimming, but he raised his head now and then
The manager thought________difficult to finish the task in such a short time.
We are so ________ at the news that so many people were ________ and killed in the earthquake.
At last,the judge condemned the criminal________ten years in jail.
Reportedly yesterday a group of American soldiers were walking along the road in Iraq when a bomb was ________,three of whom were killed.
Mr.Smith wished to forget everything________with his former life.