It suddenly occurred to him ________ he had left his keys in the office.(2012·江西)
A．whether B．where C．which D．that
Have you noticed the problem ________ he is now in low spirits？________ come?
A．where；What B．that；How
C．in which；For D．what；As
(2011·辽宁，32)When the news came ________ the war broke out，he decided，to serve in the army.
A．since B．which C．that D．because
________ was known to us all that Johnson had broken his promise ________ he would give each of us a small gift.
A．As；which B．What；that
C．It；that D．It；which
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
