根据语境，写恰当的句子，补全下面的对话。
A: Excuse me, Wei Fang. ________
B: Sorry, _________________ .Tony is coming. You can ask him.
A: __， what’s the time, please?
C: It’s about 3:30.
A: Thank you, Tony.
C: You’re welcome. Look!, I found a watch. _ _ __ _ _ ___ ?
B: Is it black?
C: ___________________________.
B: Let me have a look. Oh, it’s my watch.
C: Here you are.
B: Thanks a lot.
Tan Dun's music Water， which is full of the sounds of nature， is listening to．（值得）
The temperature in our hometown usually drops zero in winter． （在……以下）
Follow these small ， and you can make a big difference to the Earth．（步骤）
Knowledge is a treasure， but practice is the to it． （钥匙）
当我们处于困境时，我们不应该放弃．
We shouldn't when we are in trouble．