Lightheartedness means cheerful, carefree ect.
This means the line "The sounds of water splashing and laughter echoed in the distance; Tim's friend's had gone for a late-night swim." is the phrase that is the correct answer, since it talks about the happy actions of Tim's friends.
Answer C.
The most probable <span>question which readers should ask before reading the "More than Flavorful" section is:
</span><span>Other than adding flavor, what else can herbs do?
</span>
<span>Aside from the main purpose of using herbs which is to add flavor, answers to this question will address some other uses it can provide.</span>
Okay so you just replace certain words in the sentences with the words in the brackets. For example, in the 2nd question you rewrite the sentence as Looking after animals is *far more* time consuming than looking after children. Hope this helps! :D