Use ‘a’ before ‘lot’. With certain idiomatic phrases and expressions. ‘a’ is used.
The correct sentence should be: Amar’s habit of delaying his work put his friends to
|A lot (of), A great deal (of), A good deal (of), A large quantity (of), A large amount (of),|
A great many (of), A good many (of), A number (of), A large number of (of), A great number (of)
|Eat a humble pie, in a hurry, in a dilemma, in a rage, have a walk, at a loss, have a drink, go for a walk, have a headache, have a sleep, have a dream, have a chat, have a fight, have a quarrel, make a noise, take a risk, take a meal, get/give/award a scholarship|