I saw Tom __________ into the classroom without __________.
________we went to visit Professor Smith, he________his research work.
A true gentleman is always _______ with himself and tolerant with others.
—What about the student in your class, Mr. Wang? —The doctor said that ________ sleep caused him poor memory and poor concentration.
____________ many times, but he still couldn’t understand it.
It was in the lab_________was taken charge of by Johnson_________they did the experiment.