One should have a _______ of right and wrong.
A serious study of physics is impossible _____ some knowledge of mathematics .
Three Long Island families forced to move by Hurricane Sandy have been ____ in fancy Manhattan apartments ever since free of charge.
He wrote a letter ___he explained what had happened in the accident.
China’s education reforms aim to better develop students’ ability to think _____.
—Honey ,this is a present for your birthday.— Ah ! A pair of shoes ,Nike! I think they __comfortably.