—Tom is ill. What’s wrong with him? —Poor boy. His illness is the _________ of eating unhealthy food.
Yesterday my parents and I went to Tianyi Square, and we enjoyed _____ around there.
----- Your English is very good, who taught you? ----- Nobody. I taught _____.
_____ he is ill, _____ he still goes to work.
-----_____ do you exercise? -----Once a week.
Which is _____, the sun or the moon?