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

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Exercise 1: Find the word which has a different sound in the part underlined.
Read the words aloud.
1. A. algal
2. A. thermal
3. A. pollution
4. A. untreated
5. A. physical
B. aquatic
B. thankful
B. earplug
B. measure
B. visual
C. contaminate
C. there
C. dump
C. pleasure
C. music
D. permanent
D. thorough
D. dust
D. bread
D. because
Exercise 2: Find the word which has a different position of the main stress in
each line.
B. pollute
B. pollutant
B. political
C. effect
C. permanent
C. historical
B. measurement C. scientific
C. physical
1. A. affect
D. litter
2. A. cholera
D. groundwater
3. A. radiation
D. contaminant
4. A. seriously
5. A. aquatic
D. logical
D. botanical
B. historic