1. we see these photos, we are reminded of the old happy days.
2. You can stay at my cottage in the country you like.
3. 微写作 无论何时我想放弃，我就会想起那些永不停止尝试的伟大科学家。

1. Whenever
2. whenever
3. Whenever I feel like giving up, I will think of those great scientists who never stopped trying.(答案不唯一)

4. When talking about the history of it, Wu Wenguang, a famous (perform) of the guzheng, likes to tell a folk story about the sincere friendship between a musician and his biggest fan.
5. With the simple lyrics, beautiful melody, and lively ( perform ), Yimeng Mountain Tune has become a symbol of Yimeng and a musical symbol of Shandong.
变形：perform vt.→performance n.表演
→performer n.表演者

4. performer 5. performance

6.They were (disappoint) that the school picnic was put off because of bad weather.
7.The director sadly admitted that the lead actor’s performance was (disappoint).
8. our great disappointment, we fell behind. But we stuck together and never gave up.
变形：disappoint vt.& vi.→disappointed adj.失望的
→disappointing adj.令人失望的；令人沮丧的
→disappointment n.失望；沮丧

9.He found it difficult to hide his (disappoint) when he didn’t arrive. He had expeted to see her so much.
10.At the Expo, some engineers were not only disappointed ① themselves but also disappointed ② the imperfect products. However, nobody felt ③ (disappoint) at AI development. They learned from mistakes and decided to never give up creating better smart products.
续表

6. disappointed 7. disappointing 8. To 9. disappointment
10. ①with ②at/about/with/by ③disappointed