Here are the answers for the exercise involving simple present, continuous present, and simple past tense:

1. Hurry! The bus (come) **is coming**. I (not want) **do not want** to miss it.
2. Listen! Somebody (sing) **is singing**.
3. Yesterday, I (go) **went** to the restaurant with a client.
4. We (drive) **drove** around the parking lot for 20 mins to find a parking space.
5. Usually, I (have) **have** lunch at 12:00. **Do you** (have) lunch at 11:00?
6. At the moment, my sister (read) **is reading** a book.
7. I (like) **like** ice cream.
8. The waitress (ask) **asks** us if we (have) **have** reservations.
9. I (say), "No, my secretary forgets to make them."
10. How often (you/read) **do you read** a newspaper?
11. The sun always (rise) **rises** in the East. Look! It (rise) **is rising** now.
12. I (not go) **did not go** to school last Sunday.

Feel free to ask if you have any questions!