____ caused the accident is still a complete mystery.
| A．What | B．That | C．How | D．Where |
Last year I applied to Princeton University．I ____ they would say yes—but they did, and now here I am．
| A．never think | B．am never thinking |
| C．have never thought | D．never thought |
When ____ to feel unworthy, children often work extra hard to please their parents．
| A．to make | B．making | C．made | D．having made |
____ this may sound like a simple process, great care is needed．
| A．Since | B．Once | C．Although | D．Unless |
—I wonder why he has been acting so strangely these days．
—Recent pressure at work may ____ his behavior．
| A．account for | B．call for | C．change for | D．stand for |
—Do you feel like going to the cinema tonight?
—Sorry, I ’ m so tired．I ____an early night．
| A．have | B．am having | C．have had | D．had |