1. A. collection B. helper C. contest D. everyone
The underlined "c" in "collection" has a different sound (a hard "k" sound) compared to the soft "k" sound in the other options.
2. A. father B. family C. happen D. matter
The underlined "f" in "father" has a different sound (a voiceless "f") compared to the voiced "v" sound in the other options.
3. A. standard B. natural C. potato D. factor
The underlined "a" in "standard" has a different sound (a long "a" sound) compared to the short "a" sound in the other options.
4. A. laugh B. naughty C. daughter D. taught
The underlined "gh" in "laugh" has a different sound (a silent "gh") compared to the "f" sound in the other options.
5. A. elegant B. email C. special D. network
The underlined "e" in "elegant" has a different sound (a long "e" sound) compared to the short "e" sound in the other options.
 

A
A
C
B
B.
CHẤM DDIEEEMR NHEEE.