— Did Jack come back early last night?
— Yes. It was not yet eight o’clock ______ he got home.
| A．before | B．when | C．that | D．until |
—What’s the matter with Tim?
—Oh. His electronic dictionary was left in a taxi accidentally, never ________ again.
| A．to find | B．finding | C．to be found | D．being found |
____ 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 |
Today, we’ve discussed a number of large summer gatherings for feasts and celebrations _____the Inuit usually swap stories.
| A．where | B．when | C．which | D．why |
—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 |