Please, correct the mistakes.

1)Now we are ready to start listening to the dialogues.现在，我们已经准备好了, 可以开始收听听这番对话。

2)Today's topic is festivals.今天的话题是节日。节庆 would be better. 
3)Maybe you have heard of the art festival. 也许你听说过这艺术节。
4)Festival It currently takes place in Russia.目前，艺术节发生 正在俄罗斯 举行.  
5)I invited my friend to the concert.我邀请了我的朋友去参加演唱会 [Must have this otherwise, she's invited to sing at the concert!]。
6)How do you spend your free time? 你如何度过[too formal in a conversation]怎样打发你的空闲的时间呢？
7)He is probably the most famous artist of 20th century 他很可能是20世纪最著名的艺术家
8)We have a lot in common. 我们有很多共同点。 Again too formal in a dialog.  Not realistic in such an informal setting. 一样的兴趣
9)We used to write essays at my house when my father was working.We had have about three hours before my dad got gets home. 我们曾经在我家里写文章的时候，我的父亲 还在是工作。[Don't translate Google Translate for complicated sentences!] 我们有大约有三个小时前，然后我爸爸就回到家了。[I have to write it this way so as not to change the basic structure of your sentence]

Please, correct the mistakes.

1)Now we are ready to start listening to the dialogues.现在，我们已经准备好开始收听对话。
2)Today's topic is festivals.今天的话题是节日。
3)Maybe you heard of art festival. 也许你以前听说过艺术节。
4)Festival currently takes place in Russia.目前，艺术节正在俄罗斯举行。
5)I invited my friends to the concert.我邀请我的朋友去听音乐会。
6)How do you spend your free time? 你如何度过你的空闲时间？
7)He is probably the most famous artist of 20th century 他很可能是20世纪最著名的艺术家
8)We have a lot in common. 我们有很多共同点。
9)We used to write essays at my house when my father was working.We had about three hours before my dad got home.在我父亲工作的时候，我们常常在我的房间里写论文。在我父亲到达家之前，我们大约有三个小时。