When you listen to the phrases, they sound like a statement in lieu of a question.
Thanks for pointing this out, I have changed the audio on some of the sentences which you will agree are now better.
On some, I agree there is little intonation change, but not on all. However, as all these questions start with a question word, there is no need for the speaker to rely on intonation to make sure they are understood as questions.
That's very true indeed.
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