---You speak very good English. ---____.
She is only a (n) __________, not a friend of mine.
It was __________ back home after the experiment.
Do you think the concert last weekend was of __________?
The girl asked, "Could you help me solve the math problem?" "Of course, I can." he replied __________.
It was __________ computer games that cost the boy a lot of time __________ he ought to have spent onhis lessons.