What time should I call back?

我应该何时再打来？

Isn't this the Nanjing University?

请问是南京大学吗？

Oh, Somebody's at the door. I have to go.

哦，有人来了，我得去开门。

Hello, this is Wang Ming. May I speak to Gao Ling, please?

喂，我是王明，我可以和高玲通话吗？

It's 5:00 p.m. today.

今天下午5点整。

How much notice of cancellation is necessary to get my deposit back?

想把定金拿回来，要提前多长时间通知你才行？