Ex 2. Choose the word whose main stressed syllable is placed differently from of the other in each group. 1. A. regular B. allergy C. already D. yesterday 2. A. computer B. depression C. important D. concentrate 3. A. healthy B. disease C. sickness D. expert 4. A. amount B. sunburn C. toothache D. pattern 5. A. recover B. vitamin C. calorie D. temperature