Here are the best options for each blank:

1. **A. comes**
(Akiko is from Japan, so it makes sense to say she "comes" from there.)

2. **C. has**
(She "has" big black eyes, indicating possession.)

3. **A. hair**
(Brown "hair" is the correct option to describe the color of her hair.)

4. **C. friendly**
(She is very kind and "friendly" since it aligns with her helpful nature.)

5. **A. her**
(It’s correct to say "I teach her some Vietnamese, too.")

So the completed sentences would read:

"One of my new friends is Akiko. She **comes** from Japan. She lives with her parents and two sisters. She **has** big black eyes, brown **hair**, and a beautiful smile. It's bright and warm. She is very kind and **friendly** because she always helps me whenever I have any difficulty. I teach **her** some Vietnamese, too."