The word to insert would be are, because ( I don't remember the exact name of the term) it allows the sentence to run more smoothly. I believe it is called an article, but I am not quite sure.
Answer:
One series of stories focuses on Yuan Woo, who comes to America in 1947, having lost her family,
including twin daughters, during war. She does not know her daughters were rescued. Now remarried, she
settles in San Francisco, has a daughter, Jung-mi (June), and starts a Joy Luck Club similar to one in China
with three other women. The four form strong friendships.?
Explanation:
If I'm not mistaking it's limerick
