Did you know that you can use apps on your mobile phone or on a website which transform any text you suggest to them into a speech ? Some websites even provide an .mp3 file which you can download. Most of the time, you can change the voice, and the accent as well. It’s not always convincing in a general manner, but at least it gives you a precise rendition of how each word should be pronounced.
I think these may be precious tools to help you improve the quality of your oral expression, and even your listening comprehension.
Here are a few examples :
For trial : http://www.readspeaker.com/voice-demo/
More developed free version : https://www.naturalreaders.com/
Another website : http://ttsreader.com/
On this one, you can get an MP3 too : http://www.fromtexttospeech.com/
For your phone (Android…) :
On a volcano 