The most impressive sites of Chishui Danxia are its various waterfalls, ________ the Shizhang Waterfall is the largest one.
| A．for which | B．in which |
| C．from which | D．of which |
He accidentally ________ he had stolen something from a shop and had been punished by the guards．
| A．let out | B．took care | C．made sure | D．made out |
_______ you met with Yao Ming for the first time?
| A．When it was that | B．Was it when that |
| C．When was it that | D．Was it that when |
Only when they were told of the importance of time ________ wasting time is like wasting part of their lives．
| A．those boys realized | B．those boys had realized |
| C．had those boys realized | D．did those boys realize |
You shouldn't leave the water ________ while you wash clothes; it's a waste of water．
| A．run | B．running | C．being run | D．to run |
There is no experience you can have ________ is more exciting than skating on real ice．
| A．that | B．it | C．what | D．this |