It is not always easy for the public to see _______ use a new invention can be of to human life.
Her face went red _____ he had said.
The teacher asked an easy question, but not a proper answer _____.
When Li Ming got to America, he found his English was quite different _____ he had learned in China.
He promised to _____ me with a beautiful gift.
Children are usually mean. _____ they take much, they won’t give.