1·If you make a promise, you should keep it.
如果你许下一个诺言，你就应该遵守它。
—— 《柯林斯英汉双解大词典》
2·If you want to be a Junior Ranger, you need to learn about the natural and cultural history, and make a promise to be a national park protector.
如果你想成为一名初级护林员，你需要了解自然和文化历史，并承诺成为一名国家公园保护者。
3·It's also popular to make a promise in the New Year.
也很流行在新年里许下承诺。
4·If you make a promise, abide by it.
你如果做出诺言，就要履行诺言。
5·If I make a promise, I'll keep it.
如果我许下诺言，我就遵守。
6·When we make a promise, we keep it.
当我们许下承诺时，我们信守诺言。
7·One should not easily make a promise.
一个人不应轻易许下承诺。
8·If you make a promise you must keep it.
你一旦许下诺言就必须要遵守。
9·If you make a promise you should keep it!
如果做出承诺你就该去遵守！
10·If you make a promise you should fulfil it.
如果你许诺了，你就要履行你的诺言。