Pay attention,please.
could i have your attention,please?
could you pay attention for a moment,please?
please listen to me and pay attention to the explanation
1. Attention please!!
2. Can all of you pay your attention to me for a few minutes please ??

3. hey guys, i've got good news for all of us. and this is very secret, come here and listen to me
4. Hi guys, today I will about to do duty mathematics.