It's a small world.

世界真小！

Whatever you say.

随便你。

It's a hard job, but I hope he can make it.

这不是件容易的差事，但我希望他能做到。

I hope I'm not in the way.

我希望没有造成妨碍。

I look forward to receiving your reply.

我期待着你的答复。

I'm very pressed for cash at the moment, can I pay you next week?

我现在手头有点紧，再周再付给你行吗？