Believe it or not，I'm sure that is ________ people call the six sense.
A．when B．what C．which D．why
Meals in Spain are quite different from ________ they have in China.
A．which B．what C．that D．whom
________ seems to be a strong competition in China for senior high students to enter universities does exist in other countries as well.
A．It B．Which C．What D．That
Before the problem can be solved，it must be obvious ________ the problem itself is.(2011·湖南，31)
A．what B．that C．which D．why
His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽，33)
A．that B．how C．who D．what
It is by no means clear ________ the president can do to end the strike.(2012·新课标全国)
A．how B．which C．that D．what
