Earth is believed ______ by an object the size of Mars at some point in the distant past before itssurface cooled.
Mr. Green drove slowly on the way home until he reached the high way, ______ the speed limit was 60 miles per hour.
We’ll continue to learn by ourselves when we have left school, we must _______ learn how to study in the school now.
Although he was disabled when he was only ten years of age, yet he aimed _____, for which his classmates spoke _______ of him.
So far, several ships have been reported missing _______ the coast of Bermuda Island.
-_______ I tell the head teacher all that has happened? -No, you _______! Mr. Xin would be terribly angry.