Scientists study ________ human brains work to make computers.(2012·四川，17)
A．when B．how
C．that D．whether
It suddenly occurred to him________he had left his keys in the office.(2012·江西，25)
A．whether B．where
C．which D．that
Jerry did not regret giving the comment but felt ________ he could have expressed it differently. (2012·北京，24)
A．why B．how
C．that D．whether
As many as five courses are provided，and you are free to choose ________ suits you best. (2012·陕西，20)
A．whatever B．whichever
C．whenever D．wherever
It doesn’t matter________you turn right or left at the crossing—both roads lead to the park. (2012·天津，9)
A．whether B．how
C．if D．when
I made a promise to myself________this year，my first year in high school，would be different.(2012·浙江，4)
A．whether B．what
C．that D．how
