O-Net 2021

(Item 21-25)

Dear Nikhom,
I'm home with my family at last. It was very much long journey
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and I am a little bit jet lagged. I had to get it over soon.
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First I'd like to thank everybody again with your warm hospitality
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while I stayed at your home. Everybody is treating me as part of the
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family. Now I felt real homesick and miss you all.
                      25
I'll write again soon.
Takecare, 

What is the most suitable answer for  24 ?

1. had to treat
2. would have treated
3. was treating
4. treated
5. should treat

Answer: 4. treated