Choose the word having the underlined part pronounced differently in each line

Choose the word having the underlined part pronounced differently in each line.
1. A. sure
    B. tasty
    C. salt
    D. spring

2. A. weather
    B. feather
    C. brother
    D. marathon

3. A. tower
    B. crowded
    C. now
    D. know
 
4. A. match
    B. square
    C. badminton
    D. grandfather

5. A. there
    B. theatre
    C. neither
    D. feather

6. A. europe
    B. now
    C. photo
    D. sold