Fill in the blanks with suitable prepositions, articles and zero articles.You have to put a cross (x) where article is not needed. 

 It was 4 in the afternoon. Hamid was studying (a) ---- the library when his cell phone rang. It was his younger sister, Runa. She said that she was standing (b) ---- front of (c) ---- shopping mall opposite Hamid's office and asked him to meet her there as soon as possible. Hamid hurried out of d) ----- library. As he went (e) ----- the street, he noticed that Runa was not alone. She was holding (f) ----- three to four years old girl (g) ----- hand, (h) -----child was crying and Runa was trying frantically (i) ----- to pacify her. Some passers-by were looking (j) ----- them suspiciously. When he reached her, she started to explain.

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.