I didn’t quite follow him because he explained the theory _____that is too abstract for me.
Mr. White will come to the party on Sunday, _______ he promised to every one of us.
_______ that caused him to serve dinner an hour later than usual.
China _______ a sharp increase in the number of aged people over the past decade.
Mr. Frank asked me a question _______ I could go with him to _______ he called the Treasure House the next week.
—The terrible accident is under investigation. —Actually, quicker action ______ those workers trapped in the mine.