To call it a day is to quit work and go home / to say the days work has been completed.
Here, you would need to add the preposition "in."
The sentence should read: My elder sister is really interested in the problems of the environment.
Other prepositions would not make sense and could confuse the reader as to the intended meaning.
The word could be a series of past tense words
I slept late this morning
I bathed late this morning
But the words that make most sense to me is
I ate late this morning
Answer:
c
Explanation:
I think it c because if you read it and you see it right and but you also have to look at it cafly
Answer:
The flowers beautiful petals were softer than silk
