Sure! Here are the completed sentences with the appropriate forms of the verbs (active or passive) along with explanations:

1. (read) This book **is read** by many children all over the world.
- **Explanation**: The passive voice is used because the focus is on the book and the action done to it rather than who reads it.

2. (will deliver) The package **will be delivered** this afternoon.
- **Explanation**: The passive form is appropriate here as it emphasizes the package receiving the action of being delivered.

3. (arrive) The plane **arrived** two hours late yesterday.
- **Explanation**: This uses the active voice because the subject (the plane) is performing the action of arriving.

4. (steal) I am so angry. My bike **was stolen** yesterday.
- **Explanation**: The passive voice is used to focus on the bike which was the object of the action (the act of stealing).

5. (will write) John **will write** a letter to me.
- **Explanation**: The active voice is used here since John is doing the action of writing.

6. (confuse) I don't understand this. I **am confused** by it.
- **Explanation**: The passive form is used to express that something has been done to me (I am the one confused).

7. (not invite) We **were not invited** to the party tonight.
- **Explanation**: The passive voice is used to emphasize that we did not receive an invitation.

8. (happen) A car accident **happened** last night.
- **Explanation**: This is in the active voice because the accident itself is the subject performing the action.

9. (visit) The Eiffel Tower **is visited** by millions of people every year.
- **Explanation**: The passive voice highlights that the Eiffel Tower is the recipient of the action of visiting.

10. (bake) My mom **bakes** many cookies for the bake sale.
- **Explanation**: The active voice is used since the subject (my mom) is performing the action of baking.

If you need any further assistance, feel free to ask!