题目内容：

阅读下列短文，根据短文内容填空，在未给提示词的空白处仅填写1个恰当的单词，在给出提示词的空白处用括号内所给词的正确形式填空。

Chinese dumplings are one of the most celebrated Chinese foods. Although the exact history is unclear, the Chinese 1. (enjoy) them since around the first century. Strictly speaking, there 2. (be) only two kinds of jiaozi: boiled and steamed. While not classified as jiaozi, other kinds of dumplings are popular in China as well. Guo tie, pan-fried dumplings called "potstickers" in North America, are a popular snack. Wontons, dumplings with a very thin outer layer, 3. (find) in soup often. Some dumplings can even have soup inside of 4.(they), like the mouthwatering xiaolongbao.