________ was most important to her，she told me，was her family.
| A．It | B．This | C．What | D．As |
I’m afraid he’s more of a talker than a doer，which is ________ he never finishes anything. (2011·山东，26)
| A．that | B．when |
| C．where | D．why |
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 |