1 . ________(寓意活力，和谐，统一的中国结是一种独一无二的艺术品 symbolize), and embodies people’s best wishes. (根据汉语提示完成句子)

2 . It is worthwhile to make an attempt at the digital imaging technology, ______(它有助于提高效率) (根据汉语提示完成句子)

3 . Whitacre’s next effort was the Virtual Youth Choir for UNICEF, ________________ (其第一次在舞台上亮相) on 23 July 2014 in the UK. (根据汉语提示完成句子)

4 . They are recording and collecting digital images of cultural relics from the Mogao Caves, __________ (它是一个重要站点) along the Silk Road throughout China’s ancient history. (根据汉语提示完成句子)

5 . The animated version of The Three-Body Problem, which ____________________(改编自畅销科幻小说，adapt), met mixed responses from the audience since its release in December. (根据汉语提示完成句子)

6 . I hope you can help the students in our class to learn more about English and western culture, ________(这能增进我们的相互理解)．

7 . 句型公式: which引导的非限制性定语从句
In the same year, gold was discovered near San Francisco, __________ (这开始了淘金热). （根据汉语提示完成句子）