It is reported that no problems have been discovered in milk products such as Yili, Sanlu and Mengniu, ________ proves newly-produced liquid milk safe.
| A．that | B．what | C．which | D．where |
— How about camping this weekend, just for a change?
— OK, ______ you want.
| A．whichever | B．however |
| C．whatever | D．whoever |
—Was it under the tree ______ you went away talking to a friend?
—Sure. But when I got back there, the bike was gone.
| A．that | B．when | C．where | D．while |
Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.
| A．as | B．that | C．which | D．where |
The argument is extremely heated ______ there are necessary conditions of existence such as water on the Mars.
| A．that | B．whether | C．if | D．which |
In my home breakfast ______ at 7 o’clock, which has ______ unchanged for 20 years.
| A．ordered; lasted | B．is served; remained |
| C．serves; stayed | D．is ordered; developed |