According to the passage, what does the word “it” in line 4 refer to?

Mark the letter A, B, C, or D to indicate the correct answer to the following question.

They arrived ______ the airport ______ good time for the plane.

Rewrite the following sentence using the provided word to keep meaning as that of the original one (do not change the form of the word in brackets).

The company didn’t decide to replace this model. (INTENTION)

→ _______________________________________________.

Rewrite the following sentence using the provided word to keep meaning as that of the original one.

The questions are so easy that everyone can answer them.

→ They’re such _________________________________________.

Rewrite the following sentence using the provided word to keep meaning as that of the original one.

This is the most delicious cake I have ever tasted.

→ I have never ____________________________________.

Rewrite the following sentence using the provided word to keep meaning as that of the original one (do not change the form of the word in brackets).

It is stupid of you to refuse Richard’s offer of a loan. (IDIOT)

→ __________________________________________________.

What is the purpose of the passage?