Scientists have found evidence ________ global warming caused the world's first horses to become smaller nearly 50 million years ago.
Every day ____ a proverb aloud several times until you have it memorized.
A good listener takes part in the conversation,offering ideas and ___ questions to keep the talk flowing.
____under the tree was a charming girl aged about seventeen or eighteen.
—Will you attend the meeting this afternoon? —But I ________ told anything about it.
He wrote a long letter ___he explained what had happened in the accident.