Complete the conversation with WILL('ll) or WON'T
A: Oh, no. The dog ran away again! - B: Don't worry, he (1) _______ come back.
He will come back.
A: Are you sure he (2) ______?
Are you sure he will?
B: OK, he might not come back today. But I'm sure he (3) _______ come back tomorrow.
But I'm sure he will come back tomorrow.