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What do you think?
What is your opinion about?
Tell me about? etc.etc.
Open questions typically begin with words such as "Why" and "How", or phrases such as "Tell me about...".
Questions in a way that we can answer...many a questions at a time will yield very poor response.
Typically will start with How, Why, Will you explain/tell....
What do you think, what would you do, what's your opinion, would you talk about
Are you happy with your current supplier?
Do they give you all that you need?
Would you like to find a better supplier?