(Jiho's brand story)
Q. What is different with one another?
1. I was listening to music. [listening]
2. I finished doing my homework. [doing]
3. Jiho is good at playing soccer. [playing]
4. Reading English books will help you. [Reading]
5. My hobby is collecting baseball cards. [collecting]
Answer: Listening  (because listening was used as a verb not a noun)

(Jiho's brand story)
Q. what is same as A. does?
[This is my brand story. Starting a business isn't easy. It A.does take a lot of time and effort.]
1. You do look nice in that hat. [do]
2. Why don't you walk to school? [don't]
3. He talks too much, doesn't he? [doesn't]
4. He runs faster than you do. [do]
5. The other day, she came to my house to do homework together. [do]
Answer: 1. Do (because it emphasizes that hat really looks good on that person)

(From Nature to Architect)
Q. What is same as A.where ?
[I hope that it'll be a place A.where everybody can come to find peace.
1. Where should I go?
2. Where are you going?
3. Do you know where I am going?
4. I wonder where the post office is.
5. This is the middle school where I go.
Answer: 5