Can someone help pls:(

17.) may

18.) couldn't

19.) should

Explanation:

17- May

18- couldn't

19-should

20- must

Explanation:

Say the whole sentence and put in each of the answer choices and choose which sounds the best and which word makes the most sense with the sentence it really helps.

Hope this helps have a great day!

i have heard the mermaids singing, each to each.

i do not think they will sing to me

it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.