3.  The dress which she was wearing was rather long. 

4. The letter which I got this morning was from George.

5. The answers which she gave were not correct. 

2/

1. I apologized to the woman whose coffee I spilled.

2. The man whose wallet was stolen called the Police. 

3. The professor whose course I am taking is excellent.

4.The People whose house  we visited were nice. 

5. I live in a dormitory of which residents come from many countries. 

3. The dress which she was wearing was rather long.

4. The letter which I got this morning was from Geogre.

5. The answers which she gave were not correct.

......

1.  I apologized to the woman whose coffee I spilled.

2. The man whose wallet was stolen called the police. 

3. The professor whose course I am taking is excellent.

4. The People whose house we visited were nice. 

5. I live in a dormitory of which residents come from many countries.