1. I'll be back as soon as possible.
2. I'll work as hard as I can.
3. Try to be as careful as possible.
4. Come as quickly as possible.
5. Run as fast as you can.
Father: I hope you'll do better this semester. I was disappointed in your grades last year.
Son: Don't worry, Dad. I'll study as hard as I can.
Father: I hope so. If you have any questions, just ask me I'll help you as much as possible.
Son: Thanks, Dad.
Father: Your education is important for your future.
Son: I know. I'll work as hard as I can.