He always took a notebook with him _________he could take down something important at all times and all places.
____ the teacher expected, the students were very excited after hearing the good news.
It was in the United States that I made the _________ of Professor Jones.
Many experts stick to the view _____ teacher development is _____ the key to quality education lies.
I have to go to school by bus because my bicycle _____.
The course books are _____ by four tapes, which are beneficial to beginners.