2 . To their disappointment, they failed to cook a Mother’s Day breakfast at the first attempt. (句型转换)
→ ________ was that they failed to cook a Mother’s Day breakfast at the first attempt. (用what引导的主语从句)
→They failed to cook a Mother’s Day breakfast at the first attempt, ________ . (定语从句)

3 . 有些男生对玩电脑游戏简直到了痴迷的程度，这对他们的健康非常有害。（一句多译）
a. Some boys are addicted to playing games, ________________. (定语从句，harmful)
b. Some boys are addicted to playing games, ________________. (分词短语作状语，harm)

4 . 该活动旨在推广中国文化，将于3月23日(周六)举行。
The activity, __________________, will take place on March the 23rd, Saturday.(定语从句)

5 . 你也可以参观城市博物馆，从你住的酒店走着就能到。(应用文之建议信)
You can also visit the city museum, _________.

6 . Jingyuetan National Park, located in the southeast of Changchun City, covers an area of about 150 square kilometers. (用定语从句改写)
_______________________________________________________________________________

8 . 英语老师经常鼓励她，这消除了她对自己的怀疑。(定语从句)
Her English teacher often gave her encouragement, ________________．

9 . 我还遇到了一些来自其他国家的交换生，这让我很惊讶。(定语从句)
I also met some ________.

10 . 这里有一些建议可以帮助你适应新生活，我想这些建议不会让你失望。（非限制性定语从句）
Here are ________________.