Before joining the Department of Defense, Mr． Panetta _______ as director of the CIA from February 2009 to June 2011．
| A．would serve | B．served | C．was served | D．had been served |
I was about to go to bed _____ one of my old classmates made a call to me.
| A．when | B．as | C．while | D．that |
Cao Cao’s tomb is reported ________ in China, which attracts nationwide attention.
| A．being found | B．to be found | C．having been found | D．to have been found |
This article may shock some sensitive readers, _____I offer my apologies in advance.
| A．from whom | B．for whom | C．to whom | D．towards whom |
In ________ distance is a tall tree which is said to have ________ history of over 500 years.
| A．the；/ | B．/；/ | C．a；a | D．the；a |
Believe it or not , that is _____ people call the sixth sense.
| A．when | B．which | C．why | D．what |