Question 6: A. system                 B. liquid                          C. grassland                  D. reserve

A. system /ˈsɪs.təm/

B. liquid /ˈlɪk.wɪd/

C. grassland /ˈɡræs.lænd/

D. reserve /rɪˈzɝːv/

Question 7: A. preserve                  B. balance                          C. include                   D. combine

A. preserve /prɪˈzɝːv/

B. balance /ˈbæl.əns/

C. include /ɪnˈkluːd/

D. combine /kəmˈbaɪn/

Question 8: A. essential                 B. tropical                        C. awareness                D. aquatic

A. essential /ɪˈsen.ʃəl/

B. tropical /ˈtrɒp.ɪ.kəl/

C. awareness /əˈweə.nəs/

D. aquatic /əˈkwæt.ɪk/

Question 9: A. significant                  B. ecology                        C. appreciate                 D. fertilizer

A. significant /sɪɡˈnɪf.ɪ.kənt/

B. ecology /iˈkɒl.lə.dʒi/

C. appreciate /əˈpriː.ʃi.eɪt/

D. fertilizer /ˈfɝː.təl.aɪ.zər/

Question 10: A. oxygen                  B. pollution                        C. possible                 D. medicine

A. oxygen /ˈɒk.sɪ.dʒən/

B. pollution /pəˈluː.ʃən/

C. possible /ˈpɒs.ə.bəl/

D. medicine /ˈmed.ɪ.sɪn/