Choose the word which has different stress from others

Ex2. Choose the word which has different stress from others.
1 A. determine B. conclusion C. remember D. instrument
2 A. possibility B. compliment C. contribution D. atmosphere
3 A. experiment B. consider C. calculate D. hospital
4 A. congratulate B. requirement C. distribution D. interest
5 A. understand B. description C. happiness D. president