1. The movie was so exciting that I watched it twice.

（这部电影太令人兴奋了，我看了两遍。）

2. The song was so beautiful that I couldn't stop humming it.

（这首歌太美妙了，我忍不住哼唱。）

3. The weather was so cold that we stayed indoors all day.

（天气太冷了，我们整天都待在家里。）

4. The problem was so complex that we needed help.

（这个问题太复杂了，我们需要帮助。）

5. The cake was so delicious that I ate it all.

（蛋糕太好吃了，我把它全吃完了。）

这些句子都遵循了"so + 形容词 + a/an + 单数名词 + that + 句子"的结构，其中so修饰形容词或副词，a/an引出单数名词作主语，that引导结果状语从句。