We had waited for a long time before the famous singer .
| A．turned up |
B．turned off |
C．turned on |
D．turned down |
Modern science has given clear evidence ________ smoking can lead to many diseases.(2011·天津，13)
| A．what | B．which | C．that | D．where |
The notice came around two in the afternoon ________ the meeting would be postponed.(2012·江苏)
| A．when | B．that | C．whether | D．how |
I made a promise to myself ________ this year，my first year in high school，would be different.(2012·浙江)
| A．whether | B．what | C．that | D．how |
At first he hated the new job but decided to give himself a few months to see ________ it got any better.
| A．when | B．how | C．why | D．if |
It is still under discussion ________ the old bus station should be replaced with a modern hotel or not.
| A．whether | B．when | C．which | D．where |