A paragraph in the Past - can Present Simple be used?

[Wonderful]

Hi,

I had a test and the fill-in-the-blanks paragraph (all tenses possible) was something on the lines of (after completion of the verbs I knew):

"I met Gil in the park about a month ago and we talked... I promised I would call him. After about ten days I called him but he didn't answer. I went to see him. His mother opened the door and told me that he had escaped from the poice because he ______(1)_______ (have) many debts. I wish I ___(2)_____ (know) as I think I _____(3)______ (can help) him. Probably it ____(4)_____ (be) too late.

Can I please have your opinion as what would be in 1,2,3, and 4? In particular, in (1) can it be both "had" and "has"?

Thanks.

[Mister Micawber]

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I would prefer that you fill in the blanks first, and then I will check your work.
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Native English teacher at Mister Micawber's

[Wonderful]

Okay, here's my guess:

I met Gil in the park about a month ago and we talked... I promised I would call him. After about ten days I called him but he didn't answer. I went to see him. His mother opened the door and told me that he had escaped from the poice because he ______had_______ (have) many debts. I wish I ___had known_____ (know) as I think I _____could have helped___ (can help) him. Probably it ____is_____ (be) too late.

[Terrestr1al]