Here are the best answers for each of the blanks based on context and grammatical correctness:

**Question 19:**
D. a type of folk music
(“a type of folk music” is the most grammatically correct and natural-sounding option.)

**Question 20:**
A. meaningful
(“meaningful” accurately describes the lyrics as having significance or depth.)

**Question 21:**
A. between
(“between” is the correct preposition to indicate the interaction of two groups.)

**Question 22:**
D. different
(“different” is the appropriate word since the men respond with lyrics that are not the same.)

**Question 23:**
B. focus on
(“focus on” is suitable in this context, indicating that the song lyrics concentrate on specific themes.)

**Question 24:**
C. costumes
(“costumes” fits well as it refers to the clothing typically worn in traditional performances.)

So, the completed passage would read:

"Quan ho is (19) **a type of folk music**, which is often performed in spring festivals in the north of Viet Nam. It was first recorded in the 13th century in Bac Ninh province. It features (20) **meaningful** lyrics, folk beauty of music and the way it is performed. The songs are performed as alternating verses (21) **between** two women from one village who sing in harmony, and two men from another village who respond with similar melodies, but with (22) **different** lyrics. Most of the song lyrics (23) **focus on** topics related to love and village life. Traditionally, the women wear large round hats called non quai thao and scarves, while the men's (24) **costumes** include turbans, umbrellas and tunics."