4. I'd like to send you a pair of compasses ， ______ were a present given to me by my sister on my last birthday and I think it will be of great help to your study.
5. There is little evidence to support the fact _______ human or plant life would not be able to exist without this essential liquid.
6. ______ she was getting me settled into a tiny but clean room， the head of the village was tying up his horse to my car to pull it to a small town some kilometers away _______ there was a garage.
7. People find life in Canberra relaxing and pleasant. The city is surrounded by beautiful mountains _______ people can ski. There is a large man _______ made lake lined with beaches and parks in the center of Canberra.
（二）篇章训练：用适当的连词填空。
A
Years ago I worked with the Notco Company as the head of the designing department. One of the best designers was called Steve King ， 1________ was clever and hard-working. We didn't know his secret 2________ one day when he had an accident. His legs were badly hurt and he was taken to the hospital. 3________ the doctor wanted to examine his legs， he refused to take off his trousers. Then he told the doctor his secret 4________ he was a woman. She had pretended to be a man in order to get a job she liked. That night 5________ I went to visit her ，I discovered her secret. The next day the company had a meeting about the problem of Ms King. 6________ the
company had never had women engineers working ，we finally decided to let her stay. From then on， more women workers were employed by the Nocto Company.
B
China is a large country of agriculture. 1________you know ， there are more than 800 million farmers in China. China started to develop the science of
agriculture much earlier than other countries in the world. 2________the people in Europe and America were trying to shoot wild animals and birds for food， farmers in China were studying the science of agriculture. For example， Jia Sixie， 3________lived in the Northern Wei period， was one of the farming pioneers. 4________he finished his work in the government， he returned home and spent his time on research into agriculture. He collected information， did experiments and learnt from the experiences of farmers. He wrote a book called Qi Min Yao Shu. The book ， 5________has 110，000 characters ， is about both farming and gardening. This book is considered to be an important summary of the knowledge of farming. 第四题参考答案：
1. 答案：what. 解析：介词后的从句为宾语从句，从句中缺宾语，故填连接代词what.
2. 答案：who. 解析：is 后为表语从句，从句中缺主语，应填连接代词；再根据谓语动词come 可确定主语应当是人，故填who.
3. 答案：that. 解析：从句在名词后，且句子结构和意义完整，故填没有任何意义，也不作任何句子成分的连词that. 该从句是说明前面名词的具体内容的，为同位语从句。
4. 答案：that. 解析：谓语动词worries 前，应为主语从句；句子结构和意义完整，故填that.
5. 答案：when. 解析：名词后的句子，若结构不完整时为定语从句；代表先行词的关系词在从句中作时间状语，故填关系副词when （=on which）。
6. 答案：that/which.解析：名词后的句子结构不完整为定语从句；从句中spent 缺宾语，故填关系代词that/which.
7. 答案：since. 解析：根据句式可知填since.
8. 答案：that. 解析：从句结构和意义完整，填that. 这是结果结状语从句。注意，若去掉从句中的代词it ，就用as 来引导定语从句。
第五题答案：
（一）
1. where 2. before 3.who ； which 4. which 5. that 6. while ； 2）where 7. where ； who
（二）
A： 1. who 2. until 3. where 4. that 5. when 6. Though
B： 1. As 2. while 3. who 4. After 5. which