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1·Let's keep it secret and give her a surprise.

让我们保守秘密，给她一个惊喜。

2·He tried to keep it secret from his family.

这件事他试图瞒着家里。《牛津词典》

3·No one will know if we keep it secret.

如果我们不说，不会有人知道的。

4·I promise I'll keep it secret.

我保证不泄露秘密。

5·I I promise I'll keep it secret.

我保证不泄露秘密。

6·By the way, keep it secret.

顺便说一下，请保守秘密。

7·I promise you I'll keep it secret.

我向你保证我会保守秘密。

8·You'll keep it secret?

你会保守秘密吗？

9·I want to keep it secret forever and ever.

我要保持着秘密，一直到永远！

10·Often change your password and keep it secret.

密码要保密之馀，亦要时常更改。