5. Harmful - Bad - Damaging - DetrimentalDistractions can be very harmful to your studying.6. improve - Develop - Get better - AdvanceIf you study hard every day, you will surely improve your ability at thatsubject.7 Go over - Check - Doublecheck - Recheck - ReviewAfter you're done writing a sentence you should go over it to makesure you didn't make mistakes. This is called proofreading.