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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。