Did you get that?/Do you understand?
Are you listening to me?/Are you paying attention?
Is there something else going on over there?
You sound like you're distracted.
Could you repeat that to me to make sure you got it?
Did you understand everything I just said?
Are you writing this down?
I didn't catch that last part.
Could you repeat that, please?
Please speak slower.
I think I got it./Yeah, I got everything.
I'm sorry, there are too many people talking in the background. What did you say?
A: Did you get all that?
B: Let me repeat it. You will be in your office until three, after which he can reach you at 455-998, right?