Could you wait a moment , please?

请您稍等一下，好吗？

If you can wait a moment, I'll sort it all out for you.

要是你能等一会儿，我就可以把什么都给你弄好。

Wait a moment [while], will you?

等一会儿好吗？

I can't wait a moment!

我连一刻也没法等了！

Can you wait a moment?

你能等一会儿吗？