I haven't seen you for a long time.

很久没见了。

Have a good trip.

旅途愉快。

You passed your test? Fantastic!

你测验及格了？太棒了！

The course I took was above me.

我上的这门课太难了。

The children's performances brought down the house.

孩子们的演出博得满场喝彩。

I hope you won't take offense, But will accept what I say here as some fatherly advice.

我希望你不要反感，能够接受我这父亲般的建议。