Modern science has given clear evidence ________ smoking can lead to many diseases.(2011·天津，13)
A．what B．which C．that D．where
The notice came around two in the afternoon ________ the meeting would be postponed.(2012·江苏)
A．when B．that C．whether D．how
I made a promise to myself ________ this year，my first year in high school，would be different.(2012·浙江)
A．whether B．what C．that D．how
(2009·北京)At first he hated the new job but decided to give himself a few months to see ________ it got any better.
A．when B．how C．why D．if
(2011·重庆)It is still under discussion ________ the old bus station should be replaced with a modern hotel or not.
A．whether B．when C．which D．where
The limits of a person's intelligence，generally speaking，are fixed at birth，but ________ he reaches these limits will depend on his environment.(2011·安徽)
A．where B．whether C．that D．why
