---He seems to be a teacher.---______. He has been a teacher for 20 years.
Mr. Smith,________of the ________speech, started to read a novel.
The boy failed four times, but he said he would try ___________.
Recently there have been many occasions____ you have attended events on your own.
My brother likes eating very much but he isn't very _____ about the food he eats.
Scientists are convinced the positive effect of laughter physical and mental health.