How much should I leave on the table? 我得在桌子上留下多少？

　　I'd like to leave my room key, please. 我想让您保管我房间的钥匙，谢谢。

　　I think I left my keys here when I went out. 我好像走的时候把钥匙落在这了。

　　Leave it. I'll look at it if I get a chance. 放那吧，有时间我就看。

　　Don't forget to fill out those forms before you go.  别忘了走之前填好那些表格。

　　I'll leave them on your desk before I go.  我走之前会把那些表格放在你的桌子上。