Sure, here are the appropriate words to fill in the blanks:

1. I'm not too tired to walk home, I think I'll take a taxi.
2. "It's cold in this room." "Is it? **I'll put** on the heating then."
3. A: We haven't got any milk. B: Oh, I forgot to buy some, **I'll go** and get some now.
4. "Shall I do the washing up?" "No, it's all right **I'll do** it later."
5. "I don't know how to use this computer." "Ok, **I'll show** you."
6. "Would you like tea or coffee?" "**I'll have** coffee, please."
7. "Goodbye! Have a nice holiday." "Thanks, **I'll send** you a postcard."
8. Thanks for letting me borrow your camera **I'll bring** it back to you on Monday, OK?
9. "Are you coming with us?" "No I think **I'll stay** here."

These sentences use the future simple tense (will + base form of the verb) to indicate decisions made at the moment of speaking.