It is generally believed that teaching is _____ it is a science.
---So you missed the meeting. ---____. I got there ten minutes before it finished.
Imagine how excited we were ____ that our schoolmates had been admitted to some famous universities.
Helen said that she would come to see me the next day, but she_____.
Everybody believes he will be the winner of the 100-meter ____.
---What are you busy doing these days? ---____ the college entrance examination.