Fill in the gaps in the following text by adding suffixes, prefixes or the both with the root words given in the parenthesis:

Vocabulary is very important in learning a language properly. To (a) ____ (rich) your vocabulary, you have to read books and learn new words by knowing their meanings (b) ____ (accurate). You may use a dictionary to know the (c) ____ (know) words or try to understand the (d) ____ (text) meaning of them. Repeated reading will help you understand the (e) ____ (specify) topic clearly and use them in various situations.

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.