1.李昂就是那个决心清除社会上所有坏蛋的职业杀手。

Leon was a professional killer who was determined to get rid of all the bad guys in the society. 2.玛蒂尔德就是那个父母都已离世的可怜的小女孩。

Mathilda was a poor little girl whose parents both died.
3.足球是一项培养孩子跟别人合作的团队活动。

Football is a team work that trains children to work with others.
4.你想见的那个人住进了这家宾馆。

The man whom you want to see checked in this hotel.
5.这是我们昨天参观的那家工厂。

This is the factory (which/that ) we visited yesterday.
6.我昨天收到的那封信是我的一个朋友寄来的。

The letter (which/that) I received yesterday was from a friend of mine.
7.他常常回忆起童年在乡下跟爷爷去河边钓鱼的日子。

He often recalls the days of his childhood when he and his grandfather went fishing by the river.
8.这是鲁迅曾经住过的房子。

This is the house where Lu Xun once lived.
This is the house in which Lu Xun once lived.
This is the house which Lu Xun once lived in.
9.我们不知道他没有来的原因。

We don’t know the reason why he didn’t show up.
We don’t know the reason that he didn’t show up. (×)
10.中国政府正在大力发展农业，农业的重要性现在已是人人皆知。

Chinese government is trying to develop agriculture with great efforts, the importance of which is now known to everybody.
11.会议延期了，而这正是我们所希望的。

The meeting was put off, which/as was exactly what we wanted.
12.这是我看过的最好的一部电影。

This is the best film (that) I have ever seen.
This is the best film (which) I have ever seen. (×)。