Fill in the blanks with the words from the box. You may need to change the forms of some of  words Yon may need to use one word more than once.

forces

water

objects

full

important

clothes

in

the

made

currents

 The world is (a) ----- uncountable natural and man (b), air and (d) of  objects. Natural (c)are stones, trees, air and (d) ---- . Man-made objects are houses, cars. (e) ------ and chemicals. Natural (f) ------ are cyclones, earthquakes, volcanoes, storms and  ocean (g) ------ Life exists (h) ------ different conditions. It is very (i) ----- to keep (j) ----- environment clean.

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.