Find the word which has different stress from the others

Exercise 2. Find the word which has different stress from the others.

1. A. addict                  B. affect                      C. balance                   D. exist

2. A. comic                  B. improve                  C. bracelet                  D. cruel

3. A. advertise             B. melody                    C. existence                 D. organize

4. A. harmful               B. data                         C. effect                      D. leisure

5. A. relax                   B. muscle                    C. message                  D. puzzle