Don't try to get down a running train.

Don't waste your time. (Passive) = Let not your time be wasted.

Down to earth = বাস্তবধর্মী - He is a very down to earth person.

Drug addiction is a dependence syndrome. It is a condition where a person feels a strong desire to consume drugs and can’t do without them. Such people find it difficult to control the need to take drugs. The feeling to consume drugs becomes more important for them than other daily chores and even their family.

If the addicted person does not use drugs for longer time he is likely to feel depressed and isolated. Addiction is the state where mind and body just cannot do without drugs. The brain changes are persistent that is why drug addiction is often defined as a form of mental disorder.

Drunk drivers are a menace to everyone.

Effectively

Effectiveness is the capability of producing a desired result or the ability to produce desired output. It is focused on the extent to which work is done and the end result achieved.

The term efficiency can be defined as the ability to achieve an end goal with little to no waste, effort, or energy. Efficiency measures the level of performance achieved against a standard. A high level of efficiency generates the highest possible amount of outputs with the smallest amount of inputs.

An elegy is a poem, and it has a particular kind of emotion driving it. That emotion is lament, meaning to feel and express sorrow, and to mourn for something — and, yes, elegies are very often about someone who has died, but it might also be something that has died, say, a feeling, or a relationship.

Enchanter = Enchantress

Enterpreneur = Entrepreneur

Ever you been to Dhaka? 

= Have you ever been to Dhaka?

Every inch (পরিপূর্ণভাবে) - Every inch of his arms and legs was ulcerated.

Everybody wishes to be happy.

Everybody has gone there.