Choose the word which has the underlined part proonounced differently from the rest

Choose the word which has the underlined part proonounced differently from the rest.
1. a. cheese b.children c.chemical d. teacher  (nhấn "ch") 
2. a. question b.television c.occasion d.deccision ( nhấn "tion'
3. a. expensive b.spend c.tennis d.bringing ("n") 
4. a. iron b.grass c.rat d.green "h"
5. a. holiday b.happy c.hello d.honest    "ea"
6. a.heavy b.weather c.reading d.heading