SPEECH SHADOWING TECHNIQUE

Have you ever heard of the Speech Shadowing technique? 

It involves repeating a piece of English audio word-for-word as you listen.You may also shadow when you sing along to your favorite English songs. 
Have a look at this webpage to learn how to apply this technique to help you practise the pronunciation of individual words and phrases. Shadowing gets your mouth muscles moving as you train on language that you know is correct.
The pronunciation practice aspect includes connected speech. That’s how – in the flow of real speech – individual words are compressed or merge into words that come before or after.
Besides, Shadowing is said to help with the melody of phrases. If you shadow well, you’re not only pronouncing the words correctly. You’re also using native intonation.This is important because intonation patterns differ between languages. It’s not just what you say, but the music with which you say that makes for (mis)communication in your target language.
Shadowing could also help you reinforce vocabulary, collocations and structures that you already know, when used as part of a wider study routine.
In conclusion, it'll help you to improve your pronunciation, boosting your confidence when speaking English. 

Have a look at this webpage to learn how to use the technique.
And you can practise this technique with some videos in this webpage. 

Here you have an example

You can also use https://www.naturalreaders.com/online/ which converts any written text into spoken words, so it’s useful for you to practise not only pronunciation, but also  grammar and vocabulary.
You have to open the document containing a text, or type one and then you can listen to it and read along to train your connected speech.