I personally think that’s only something that you can write.
Since this is an open question with no choices, I am answering with what I think will best fill in the blank. Note: I do not know exactly what answer they are looking for.
The best answer is: REM
REM is the stage of sleep where dreaming occurs. REM stands for Rapid Eye Movement. Exactly as the title says, REM sleep is characterized by fast back and forth movement of the eyes.
Answer:
Although you have not put the answer options, we can say that the correct answer is: Rhyming
Explanation:
We can see that in Singing, referenced in the question above, there is a repetition of the same or very similar sounds in some words. This creates a rhythm and a certain musicality when reading.
This is a literary technique widely used in poems and music and is called Rhyme.
In that case we can say that the correct answer to your question is "Rhyming".