It was _____ great shock to the world that two airplanes crashed into _____ World Trade Centre in New York on Sept.11.
I kept looking at the man wearing a pair of glasses, wondering ________.
It was not until last year ________ he got in touch with his father in Canada.
Every morning at a ________ time after breakfast she gave him an hour’s lesson.
________ their service, the workers of the hotel are active in learning English.
His money had not brought happiness and perhaps it had contributed________ his strange sense of values.