6. He decided to sell the house, all of whose windows face south.

5. He cannot provide any reason why he has failed again this time.

4. Is this village the place where I lived ten years ago?

3. 2008 is the year when the Olympic Games will be held in Beijing.

2. Where is the pen with which I wrote the letter?

10. museum改成the museum。由定语从句修饰时，先行词是名词时，一般要加定冠词。

9.that改成which。that不能引导非限制性定语从句。

8. that改成as 。在定语从句中，such要与as 连用。

7. when改成which。某一天要用介词 on。

6. which改成for which。Reason要与for 连用。