$\text{1​. A - seat: /siːt/, B - seaside: /ˈsiː.saɪd/, C - sure: /ʃʊər/, D - soup: /suːp}$

$→^{}$ $\text{C - sure}$

 $-^{}$ `\text{A , B , D phát âm /s/ còn C âm /ʃ/ }`
$\text{2​. A - nice: /naɪs/, B - picnic: /ˈpɪk.nɪk/, C - science: /ˈsaɪ.əns/, D - invite: /ɪnˈvaɪt/}$

$→^{}$ $\text{ B - picnic }$ 

 $-^{}$$\text{A , C  , D phát âm /ai/, B âm /i/  }$
$\text{3​. A - pool: /puːl/, B - flood: /flʌd/, C - soon: /suːn/, D - noon: /nuːn/}$

$→^{}$ $\text{B - flood}$

 $-^{}$ $\text{A , C , D phát âm C. /ə//u:/ B âm /ʌ/ }$
`\text{4​. A - egg: /eɡ/, B - fence: /fens/, C - cinema: /ˈsɪn.ə.mə/, D - left: /left/}`

$→^{}$ $\text{D - left}$

 $-^{}$ $\text{A , B ,  D  phát âm  /e/ C âm  /ə/}$ 

$\text{5​. A - village: /ˈvɪl.ɪdʒ/, B - age: /eɪdʒ/ , C - sausage: /ˈsɒs.ɪdʒ/, D - message: /ˈmes.ɪdʒ/}$  

$→^{}$ $\text{B - age}$  

$-^{}$ $\text{A , C , D phát âm /ɪdʒ/ B âm /eɪdʒ/}$