2 . These options provides many advantages. One of those advantages is decreasing the cost of production.(同义句转换)
These options provides many advantages, __________ __________ __________ is decreasing the cost of production.

3 . According to the Beijing 2022 Organizing Committee, more than 1 million people applied to serve as volunteers and nearly 20，000 were selected, most of ________ are from colleges and universities in Beijing and Hebei Province. (用适当的词填空)

4 . A national territorial (领土的) planning system will be guided by three “red lines”, one of ________ will include about 103 million hectares of permanent farmland. (用适当的词填空)

5 . Shaanxi’s biang biang noodles were a comforting and beloved food among locals, for ________ the back story and written character were common knowledge. (用适当的词填空)

7 . 这位老人有两个儿子,其中一个在纽约工作。(介词+关系代词引导定语从句)
The old man has two sons,______.

10 . The exhibition centers on the history of the traditional Chinese paintings and displays various famous paintings of exceptional beauty from different dynasties, and you are expected to have a deep insight into the development of Chinese culture from them.（用定语从句改写）
_______________________________________________________________________________