1.A zoo is a park in which many kinds of animals are kept for exhibition.

2. My home village is no longer the place ( that ) it used to be .

定语从句中宜用which而不宜用that 的情况:

(1) 当关系代词的前面有介词时. 如：

1. That's a good book that will help you a lot.

1. There is still a seat in the corner that is still free.

(10) 被修饰成分为表语时，或者关系代词本身是定语从句的表语时，该关系代词宜用that . 如：

2. Who is the man that is standing at the gate?

(9) 主句是There be 结构，修饰其主句的定语从句宜用that 作关系代词. 如：

1. Which is the book that you like best?

1.Edison built up a factory which produced things that had never been seen before.

(8) 疑问词是who或which，关系代词宜用that，以避免重复。如：

1.Yesterday I caught two fish and put them in a basin of water .Now you can see the two that are still alive .

(7) 如果有两个从句，其中一个关系代词已用which ,另一个关系代词宜用that，以避免语言的单调或重复。如：

2.The rider and his bike that had run over an old woman were held up by the police.

(6) 被修饰词为数词时. 如：

1.The writer and his novel that you have just talked about is really well known .