23.We Chinese will never forget the day.→ September 18，1931 is the day ____________ _____________________________________.

22.His sister works in the book-store. →The book-store ________________________is the largest one in the city．

21. He joined the army on the day. →He'll never forget the day __________________________.

20.That is the day _____　he did the experiment．

Ⅲ.完成下列句子

Example：

I lived in the house two years ago. →This is the house where I lived two years ago.

19. This is the house ______I was born.

18.Do you know the day _____China entered the WTO？

17.The reason _____she was ill was that she had eaten bad meat.

16.Do you know the year _____I first went to college as a college student？

15.The picture brought the years back to me _____ I was taken good care of in the village．

14.Is there any reason ______you should have a holiday？