In an educational Institution, teacher-students relationship is (a)___ to be the most important matter. It is such a relationship that is (b)___on the basis of mutual (c)___ A student always (d)___his teachers because he cannot but (e)___help from them in case of (f)___ knowledge. The sensible students never (g)___ their teachers. Moreover, they (h)___ their memorable teachers role which helps them(i)___ in life. So, they always (j)___ their teachers.

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.