Identify the segment in the sentence which contains the grammatical error.

Rivers has been of primary importance for human settlements since ancient times.

Which of the following is an example of an artificial ecosystem?

Recently, who has become the new Prime Minister of Iran?

On which day is the birthday of which former cricketer of India celebrated?

Krishnam Raju passed away in September 2022. He was a recipient of ________ Filmfare south awards.

Directions: In the following passage, some of the words have been left out. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

It is ______ no use having a publicly-owned banking.

Which country's drug has been approved by the US agency for clinical trials on corona patients?