no doubt
used to emphasize that what you are saying is true or likely to happen:
eg:
We will, no doubt, discuss these issues again at the next meeting.
No doubt you'll want to unpack and have a rest before dinner.


no wonder
it is not surprising:
eg:
No wonder the children are excited, - this is the first time they've been abroad.
"If brutal killers like these two are at work, it is no wonder that so many Kosovans have fled, " he said.