My brother’s bedroom is always a mess, and he can never find anything, _________ is very frustrating.
| A．where | B．whom | C．when | D．which |
Have you noticed the problem ________ he is now in low spirits？________ come?
| A．where；What | B．that；How |
| C．in which；For | D．what；As |
When the news came ________ the war broke out，he decided，to serve in the army.
| A．since | B．which | C．that | D．because |
________ was known to us all that Johnson had broken his promise ________ he would give each of us a small gift.
| A．As；which | B．What；that |
| C．It；that | D．It；which |
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 |