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

I. Choose the word whose the underlined part is pronounced differently from the others’. Circle A, B, C or D.
1. A. clever B. gathering C. decorate D. exercise
2. A. match B. channel C. karate D. racket
3. A. contest B. chess C. comedy D. tennis
4. A. added B. hooked C. subtracted D. visited
5. A. jumped B. robbed C. closed D. enjoyed
6. A. missed B. liked C. wished D. opened
III. Change the following sentences in to Negative and Yes/No question.
1. They were here yesterday.
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(?)
2. I went to work last weekend.
(-)
(?)