Sure! Here's the exercise with the verbs correctly put into either Future Simple or Present Simple tense:

1. I’ll call you when I **arrive** at my hotel. (Present Simple)
2. He **will text** you as soon as he’s on the bus. (Future Simple)
3. Let’s eat dinner when John **gets** here. (Present Simple)
4. Julie **will be** late tomorrow evening, so I’ve booked a table at a restaurant for 10pm. (Future Simple)
5. As soon as I **am** able to, I’m going to get a new job. (Present Simple)
6. Please wait here until the nurse **calls** you. (Present Simple)
7. I **will get** up early tomorrow morning and finish the report then. (Future Simple)
8. Before you **leave**, please make sure you’ve locked the door. (Present Simple)
9. She **will let** us know later, when she’s ready to leave. (Future Simple)
10. I must clean the kitchen before my mother **gets** here. (Present Simple)
11. I **will come** to meet you at the station next weekend. (Future Simple)
12. I **will wait** until you’re finished – then we can go. (Future Simple)
13. John will study until he **knows** all the answers. (Present Simple)
14. She thinks that it **will rain** next weekend. (Future Simple)
15. What do you want to do after the class **finishes**? (Present Simple)
16. My aunt **plays** the guitar once a week. (Present Simple)
17. Don't worry. I **will dance** with you next Sunday. (Future Simple)
18. Duong says he loves horse-riding but he **will not continue** this hobby from next year. (Future Simple)

Feel free to ask if you have any more questions or need further assistance!