Choose the word whose underlined part is pronounced differently from the others

Exercise 1: Choose the word whose underlined part is pronounced differently from the
others.
1. A. laugh B. cough C. bought D. tough
2. A. game B. gym C. girl D. bag
3. A. calorie B. labour C. community D. volunteer
4. A. environmental B. benefit C. service D. sick
5. A. danced B. helped C. watched D. enjoyed

Exercise 2: Choose the odd one out.
1. A. flu B. cough C. headache D. hobby
2. A. gymnastics B. stamps C. books D. dolls
3. A. elderly people B. donors C. disabled people D. sick children
4. A. fresh fish B. fruit C. junk food D. vegetables
5. A. service B. non-profit C. charitable D. homeless