TO/ ON 17. BY 18. FOR 19. ON 20. ABOUTII. 1. A 2. C 3. A 4. C 5. C...

16. - PREPOSITIONS LI THUYET BAI TAP DAP AN
PREPOSITIONS LI THUYET BAI TAP DAP AN
16. to/ on 17. by 18. for 19. on 20. aboutII. 1. A 2. C 3. A 4. C 5. C 6. C 7. B 8. B 9. C 10. C