Fill in the blanks with suitable prepositions, articles and zero articles.

Metro Rail is (a) ---- mega project in the development history (b) ---- Bangladesh. To make traffic (c) ---- movement easy and smooth in the city of Dhaka, Metro Rail is sure to play (d) ---- great role. The mega city of almost two crore people is struggling badly with its narrow and (e) ---- overcrowded roads. But Metro Rail is sure to come as a sigh of relief. With its (f) ---- uninterrupted movement, it will carry sixty thousand passengers per hour (g) ---- both ends. 16th December.2022 is going to be (h) ----- unforgettable day for (i) ---- dwellers of Dhaka city. (j) ---- this day,the red and green coloured coaches of Metro Rail will take the passengers to their destinations with ease and comfort.

We are not ungrateful to the freedom fighters.

Their contribution is the greatest thing. 

An imperative sentence expresses a command, request, advice, or suggestion. It typically starts with a base form of a verb, and the subject 'you' is often understood but not stated. To form a negative imperative, 'Do not' or 'Never' is placed at the beginning of the sentence.

In the given sentence, "You should never disrespect or forget our martyrs," 'should never' indicates a strong suggestion or advice against an action. To transform this into an imperative sentence, we remove the implied subject 'you' and the auxiliary 'should', directly starting with 'Never' to convey the strong negative command or advice.

Our government has built the national memorial with a view to paying tribute to their memories. 

 (e) A freedom fighter is greater than any other son of the soil.

Our independence was got/gotten by us for their sacrifice.