Choose one word whose underlined part is pronounced differently from the rest in each group . Identify your answer by circling the corresponding letter A , B , C or D .
1.A. exhaust B. source C. enormous D. cause ( gạch chân au , ou , ou , au )
2.A. sun B. solar C. safe D. sure ( gạch chân s )
3.A. heat B. great C. release D. reach ( gạch chân ea )
4.A. geothermal B. power C. solar D. hydro ( gạch chân o )
5.A. chemical B. discharge C. change D. feature ( gạch chân ch , ch , ch , t )
6.A. nature B. nation C. suggestion D. situation ( gạch chân t )
7.A. agriculture B. extinction C. environment D. establishment
8. A. nature B. dangerous C. interfered D. devastating