It hasn’t been ______ that food from cloned animals is really safe for humans to eat.
| A．confirmed | B．considered |
| C．turned out | D．proved |
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 |
The limits of a person’s intelligence，generally speaking，are fixed at birth，but________he reaches these limits will depend on his environment.(2012·安徽，27)
| A．where | B．whether |
| C．that | D．why |
The notice came around two in the afternoon________the meeting would be postponed. (2012·江苏，27)
| A．when | B．that |
| C．whether | D．how |
It doesn’t matter ________ you pay by cash or credit card in this store.(2012·山东，25)
| A．how | B．whether |
| C．what | D．why |
It is by no means clear ________ the president can do to end the strike.(2012·新课标全国，24)
| A．how | B．which |
| C．that | D．what |