Find the word which has a different sound in the underlined part

giải thích giúp tui nữa nhó
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Exercise 1. Find the word which has a different sound in the underlined part.
1. A. mash
2. A. victim
B. metal
B. climate
B. bored
B. poison
B. thermal
C. scatter
C. volcanic
C. happened
C. nurse
C. although
C. rubbish
3. A. burned
4. A. cause
5.
A. death
6. A. bury
B. dump
7. A. volcano
B. tornado
8. A. ought
B. bought
C. brought
B. mates
9. A. cakes
10. A. wicked
B. used
C. homeless
C. plates
C. played
D. package
D. extensive
D. breathed
D. disaster
D. earthquake
D. instruct
D. historical
D. drought
D. places
D. learned.
D. land
11. A. planet
B. human
C. travel
12. A. visit
B. think
C. Jupiter
D. might
13. A. trace
B. able
C. surface
D. crater
14. A. promise
B. solar
C. possible
D. novel
15. A. temperature
B. correct
C. professor
16. A Russian
B. jumper
C. Venus
D. system
D. substance
17. A. alien
B. happen
C. imaginary
D. character