American International Group was the largest insurance company in the US_______it, suddenly closed down in September 2008.
| A．after | B．since | C．as | D．before |
_______ that caused him to serve dinner an hour later than usual.
| A．It was we being late | B．It was our being late |
| C．It was we were too late | D．It was because we were late |
China _______ a sharp increase in the number of aged people over the past decade.
| A．sees | B．saw | C．has seen | D．will see |
Mr. Frank asked me a question _______ I could go with him to _______ he called the Treasure House the next week.
| A．that; which | B．whether; that | C．whether; what | D．that; where |
—The terrible accident is under investigation.
—Actually, quicker action ______ those workers trapped in the mine.
| A．might have saved | B．must have saved | C．should have saved | D．could have saved |
— Why didn’t you try to finish the composition?
— I tried to , but I could, the bell rang announcing the end of the examination time.
| A．until | B．when | C．before | D．after |