=> 6. developments (the N) 7. possibility (a + N) 8. arrived (câu đk loại 2 If S V2/ed, S would V) 9. to help/prepare (promise to V/ help sb V) 10. will help : sẽ giúp 11. to hearing (look forward to Ving : mong đợi) 12. has changed (HTHT have/has V3/ed)