donate (v.)
捐赠
  
例句：
I donate money regularly to charity. 
我定期捐款给慈善机构。

up to one's neck
深陷于……中

例句：
She said she knew nothing about the robbery, but I'm sure she's in it up to her neck.
她说她对这起抢劫案一无所知，不过我敢肯定她深深卷入其中。
 

I can manage.
我自己能行。 

对话：
A: Shall I give you a hand with all those things?
B: That's all right. Thank you. I can manage.

A：让我来帮你拿这些东西吧。 
B：没关系。谢谢你。我自己来吧。