Mr. Wang is always the first one to be in the office ________ he lives far from his company.
----- 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?
Lily and Lucy are twins, they _____ good girls, they often help others.