Here are the suggested fill-ins for the blanks in the activity:

### Activity 4: Fill in the blanks.

1. A: Hi! I'm Sophia.
2. B: Hello, I'm __________. (You could use a name like "Max.")
3. A: How old are you?
4. B: I'm 10, too. __________ old, and you? (You could fill in "How old are you?")
5. A: It's nice to meet you!
6. B: It's nice to meet you, __________. (You could use "too.")

### Activity 5: Write the sentences with the words given.

1. Nice/meet/you!
- Nice to meet you!

2. How/old/you?
- How old are you?

3. I/eight/old.
- I am eight years old.

4. What/your/name?
- What is your name?

Feel free to adjust the names or details as needed!