Early this year cruel snowstorms hit southern China , ______ great transportation problems in some areas .
| A．causing | B．caused | C．to cause | D．having caused |
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 |
—Why did you let ____ kids off this time?
—I just want to give them ____ second chance．
| A．/; the | B．the;/ | C．the; the | D．the; a |