给定一段英语文本，将句子按照它们的难度级别分类为初级、中级或高级，每个句子应该只属于一种难度级别。


"The quick brown fox jumps over the lazy dog. The five boxing wizards jump quickly. Pack my box with five dozen liquor jugs. How quickly daft jumping zebras vex. Bright vixens jump; dozy fowl quack."
Difficulty classification:

- Beginner: "The quick brown fox jumps over the lazy dog."
- Intermediate: "The five boxing wizards jump quickly."
- Advanced: "Pack my box with five dozen liquor jugs. How quickly daft jumping zebras vex. Bright vixens jump; dozy fowl quack."