Cotton is to material as indigo 15 to________.
—Who teaches you French, John?
—I teach________.
To my surprise, father________(点头)his head without saying anything.
William Harrison was the________(第九) President of the United States.
You will find that the only way to save time is to spend it________(明智地).
Many people________(宁愿选择)to travel by plane. They think a plane is faster and safer than a train.
