2．He visited the Great Wall again.He went there two years ago.

　　→He visited the Great Wall again, where he went two years ago.

　　3．He failed in the examination.It made him a bit discouraged.

　　→He failed in the examination, which made him a bit discouraged.

　　4．He must be from Africa.It can be seen from his skin.

　　→He must be from Africa, which/as can be seen from his skin.

　　5．He has organized a team of workers.All of them are hard­working.

　　→He has organized a team of workers, all_of_whom are hard­working.

　　6．He is a man of great experience.Much can be learned from him.

　　→He is a man of great experience, from_whom much can be learned.

　　7．They have many books.Many of them are on chemistry.

　　→They have many books, many_of_which are on chemistry.

　　8．Let's think of a situation.In this situation this sentence can be used.

　　→Let's think of a situation, in_which_situation this sentence can be used.

　　9．The boy studies very hard.His father is an engineer.

　　→The boy, whose_father is an engineer, studies very hard.

　　10．The engineer is about 50 years old.My father works with him.

　　→The engineer, with_whom my father works, is about 50 years old.

　　Ⅱ.补全句子

　　1．If you want to have a journal in space, you should_adjust_to weightlessness first.

　　如果你想去太空旅行，首先应该适应失重。

　　2．Although he is outgoing, he is still not sure whether he will_fit_in_with his new colleagues.

　　尽管他性格开朗，但是他仍然对是否能和新同事相处融洽没有把握。

　　3．After months of hard work, they almost couldn't_keep_it_up.

　　数月的艰苦工作之后，他们几乎不能坚持下去了。

　　4．They are making_preparations_for the coming examination.

　　他们正在为即将到来的考试做准备。

　　5．To_live_in_comfort when he is old, he is trying hard to earn more money now.

　　为了晚年生活舒适，现在他正在努力地挣更多的钱。

　　6．Since she left university, she has_been_occupied_with endless work.

　　大学毕业以来，她一直忙于无休止的工作。

　　7．As_far_as_I_am_concerned,_your plan is very good.

就我个人而言，你的计划很好。