it， that， one， those均可用来替代前面的名词，以避免重复，其用法如下：
一、it和that都替代"the+单数名词（可数或不可数）"，都是特指，但it指前面提到的"同一"事物，而that是指前面提到的"同类"事物。如：
1. The Parkers bought a new house but ________ will need a lot of work before they can move in. （全国卷）
A. they B. it C. one D. which
「分析」答案选B.it替代"the + house"，指的就是前面提到的the Parkers所买的那座新房子。
2. Few pleasures can equal ________ of a cool drink on a hot day. （全国卷）
A. some B. any C. that D. those
「分析」答案选C.that替代the pleasure，指与前面提到的同属"快乐的事".
二、one替代"a＋单数可数名词"，表示泛指。特指的the one相当于that；the one复数形式the ones，在口语中也常用those代替；当后面有of短语时，一般用that或those，当有前置修饰语时，只能用one（s），如the red one.one（s）， the one（s）， those， that都是替代"同类"事物，其中只有that可替代不可数名词。如：
1. We needed a new cupboard for the kitchen. So Peter made ________ from some wood we had. （广西卷）
A. it B. one C. himself D. another
「分析」答案选B.one替代"a cupboard".
2. Meeting my uncle after all these years was an unforgettable moment， ________ I will always treasure. （全国卷）
A. that B. one C. it D. what
「分析」答案选B.one替代"a moment"，作an unforgettable moment的同位语。后面接的是它的定语从句。又如Cook was a strict but good captain，one who took good care of the sailors on his ship.
3. -Why don't we take a little break？
-Didn't we just have ________ ？ （全国卷）
A. it B. that C. one D. this
「分析」答案选C.one替代a break.
4. Mr Zhang gave the textbooks to all the pupils except ________ who had already taken them. （全国卷）
A. the ones B. ones C. some D. the others
「分析」答案选A.后面的定语从句是特指，the ones替代the pupils.此处也可用those.
再试试以下的高考题例：
1. （07四川） Little joy can equal ____ of a surprising ending when you read stories.
A that B those C any D some
2. （07陕西） -There is still a copy of the book in the library. Will you go and borrow _____？
-No， I'd rather buy ____ in the bookstore.
A it， one B one， one C one， it D it， it
3. （07辽宁） The information on the Internet gets around much more rapidly than ____ in the newspaper.
A it B those C one D that
答案：
1、A.that替代joy，属于不可数性的名词，只能用that.
2、A.第一空it代替the book，是同一本书。第二空代替books的任何一本，等同于a book，所以用one.
3、D.that代替不可数名词information.