Walking in the morning is good for health. Here 'walking' is a/an-

The word 'massacre' is- Do you enjoy teaching? Here 'Teaching' is a/an- Sentence এর প্রাণ বলা হয় কোনটিকে? The verb form of 'deceit' is- Reading is an excellent habit. Here, the underlined word is a – Reading is an excellent habit. Here the underlined word is a- 'He contemplated marrying his cousin.' Here 'marrying' is a/an- 'He enjoyed sleeping in the open air. Here 'sleeping' is a/a- He fathered the plan. Here the word 'father' is_ 'A lost opportunity never returns.' Here 'lost' is a –