Statistics show that men have _____ as women do for every mile they drive．
A．serious accidents as twice many B．twice as many serious accidents
C．twice serious accidents as many D．serious accidents as many twice
Leave it to me! I feel much more _____ about myself and my abilities these days．
A．confident B．energetic C．generous D．curious
Only when he read the newspaper _____ the US President Obama would deliver a speech in his university．
A．he knew B．he had known
C．had he known D．did he know
He came to a point _____ there was no more road to follow, and before him he could see nothing but a thick forest．
A．that B．what C．which D．where
_____ about the safety of her son, John's mother looked upset．
A．Concerning B．Concerned C．To concern D．Concern
Recent studies have shown that most US graduates receive cash as gifts, though the amount received ______ from person to person．
A．prefers B．promotes C．varies D．suffers
