Find the word which has different stress from the others

Find the word which has different stress from the others
1.       A. picture              B. actor                C. enjoy                D. laptop
2.       A. attend               B. address             C. finish                D. dinner
3.       A. people              B. harmful            C. energy              D. pollute
4.       A. water               B. solar                 C. install               D. expensive