Final answer:
This question is about using present simple and present continuous verb tenses.
Step-by-step explanation:
1. A: Does Mia usually study in the evening? B: Oh, yes. Actually, she is doing her homework right now.
2. A: Is Jack playing basketball at the park now? B: I think so. He often plays there with his friends.
3. A: What are you doing right now? B: I am reading a book.
4. A: Is the library open on Saturdays? B: Yes, but it never opens on Sundays.
Learn more about verb tenses in English