It was with great joy _______ Tom received the news that his lost son had been found．
| A．because | B．which |
| C．since | D．that |
That scientist ________ work is successful has been made a model worker.
| A．which | B．who |
| C．that | D．whose |
Many athletes are clear that the Olympic Games are the only time ________ they will be watched by thousands of millions.
| A．that | B．which |
| C．where | D．when |
The old man often looked back on the past days ________ he worked hard to make a living.
| A．which | B．when |
| C．where | D．that |
Recently I have bought an iPad 3 on the website of taobao. com, ________ the price is very reasonable.
| A．on which | B．in which |
| C．of which | D．from which |
Have you ever seen any trees ________ leaves were black because of the polluted air?
| A．whose | B．that |
| C．which | D．who |