9. Let me think about it, and tell you later.
让我考虑一下，一会儿答复你。
还能这样说：
Let me think for a moment and tell you later.
I'll think it over and get back to you later.
谚语：
Let every man praise the bridge he goes over.
过桥不忘造桥人。

10. Working so hard for so little, it just isn't worth it.
工作这么辛苦却拿这么少的钱，实在不值得。
还能这样说：
Working so hard doesn't match so little money.
Working so hard deserves not so little.
谚语：
We never know the worth of water till the well is dry.
井干方知水可贵。

11. You have the seniority and I know you can do the job.
你具备应有的资历，你会把工作做好的。
应用解析：
You have the qualifications and I believe you can do the job.
You have the seniority and I think you're qualified to this job.
谚语：
Know something of everything and everything of something.
通百艺而精于一。

12. We've decided to promote you to a Program Manager.
我们决定提拔你做项目经理。
还能这样说：
We've decided to give you a promotion as a Program Manager.
You could get promoted to be a Program Manager.
谚语：
A snow year, a rich year.
瑞雪兆丰年。