(2012·四川)Scientists study ________ human brains work to make computers.
A．when B．how C．that D．whether
(2012·福建)We promise ________ attends the party a chance to have a photo taken with the movie star.
A．who B．whom C．whoever D．whomever
(2012·辽宁)The newcomer went to the library the other day and searched for ________ he could find about Mark Twain.
A．wherever B．however
C．whatever D．whichever
His writing is so confusing that it's difficult to make out ________ it is he is trying to express.(2011·安徽)
A．that B．how C．who D．what
The shocking news made me realize ________ terrible problems we would face.(2011·北京)
A．what B．how C．that D．why
As many as five courses are provided，and you are free to choose ________ suits you best.(2012·陕西)
A．whatever B．whichever C．whenever D．wherever
