I. Choose the word whose underlined part is pronounced differently from the others.
1. A. laugh
2. A. calorie
3. A. environmental
4. A. danced
5 A. knocked 6. A. cough
B. cough
B. labour
B. condition B. helped
B. needed B. laugh
C. bought
C. community C. patient
C. watched
C. founded C. enough
D tough
D. volunteer D. station D. enjoyed
D. wanted D. high
