. — We had a good time in the park last Saterday. Pity you weren’t there. — I really ____ come but I was looking after my mother in the hospital.
Mr. Smith, ______ in the factory for thirty years, is on the way back to his village.
—How was that? —I was chatting on line _____ the power went out.
Our teacher always speaks slowly and clearly in class _____.
—Are you satisfied with the answer?—Not at all. It couldn't have been ______.
By the time Mr Wang returned home from Beijing, his son's wedding _______.