Answer:
- Once and for all, I think that the computer has finally received it's due.
- Every time—and I do mean every time—I finally get to work, my boss interrupts me.
Step-by-step explanation:
In the phrase "Once and for all, I think that the computer has finally received it's due" the comma was used correctly to separate the time represented by "Once and for all".
In the phrase "Every time-and I do mean every time-I finally get to work, my boss interrupts me." The dash was used correctly to separate the explanatory expression "and I do mean every time".