He will come to call on you the moment he ____ his painting.
It was at 10 o’clock last night __________ the visitors finally arrived at Pudong International Airport.
—How many times have you been to China? —In fact, it is the first time I __________ here.
—I missed the first part of the film. It was really a pity. —You __________ home half an hour earlier.
His father told me that he __________ for the United States three days __________.
He made a mistake, but he corrected the situation __________ it got worse.