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

A / choose the word whose underlined part is pronounced differently from the others 
1. A.kissed    B. Looked  C.Visited   D. Helped
2. A.There       B. Them    C.Than      D.both
3.A. cold          B. Hold       C . Hot      D . Snow
4. A .town        B .snow       C.show    D.bowl