Answered before watching the clock, along with a request that they would like to teach students. "I teach fisik", that is, answers with a broad smile: last question, have let my words.
I will be looking at the clock with the wish to teach students. "I teach physics in" That's the answer with a smile on my last question is disingenuous.
The answer will look at the clock with excuse me to teach students. "I teach physics." That is, along with a wide smile on one last question as equivocal.