英语,定语从句

英语,定语从句
4.In the meeting room,he sat beside a girl named Joan.
→ In the meeting room,he sat next to a girl （ ） （ ） （ ）Joan.
5.There is nothing to be done.
→ There is nothing （ ） （ ） （ ）done.
6.As your English teacher,I will do my best to help you with your English.
→ I,（ ） （ ） your English teacher,will do my best to help you with your English.
7.David donated a lot of paintings to the school; some are being shown in the exhibition room.→ David donated a lot of paintings to the school,some（ ） （ ）are being shown in the exhibition room.
8.It is said that the culture of ancient Rome had a great effect on the Western world for centuries.
→ Ancient Rome is said to be a country （ ）culture had a great effect on the Western world for centuries.