Can you please put your hands up?

请举手好吗？

Who knows the answer? Please put your hands up.

谁知道答案？请举手。

Put your hands up and make some noise!

举起您的手并且弄出一些声响！

If you know the answer, put your hands up.

如果你知道答案的话，请举手。

I said, if you ever loved somebody put your hands up.

我说朋友们啊，如果你们曾经有著这么一个人，把你们的双手都举起来吧。