Choose the word that has the underlined part pronounced differently for the rest

Exercise 1: Choose the word that has the underlined part pronounced differently for the rest
1. A. this B. think C. thank D. thieves
2. A. show B. programme C. sport D. most
3. A. channel B. game C. national D. relax
4. A. child B. watch C. chin D. school
5. A. sit B. in C. if D. fine
6. A. thirsty B. than C. therefore D. those
7. A. newsreader B. weather C. week D. leave