Put the bracketed verbs in the right tense: The superintendent of one...

[Assile]

This is an extract of the exam that I failed and I want you to help me please
Thank you

Put the bracketed verbs in the right tense

The superintendent of one reformatory said that the he knew many boys who, if they [were left] in the street, would have been a pest to the country, but who [now are filling] situations in life and becoming useful members of society. The cost at which this amount of good [done] was very small, little more than $6per annum.when he considered that criminals [transported] at a cost of from $ 30 to $ 40 a year each, he [felt] astonished that the various ragged schools were allowed to remain in struggling circumstances.

[Mister Micawber]

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The text itself is a little awkward, but I think the corrections in bold are in order:

The superintendent of one reformatory said that the he knew many boys who, if they [had been left] in the street, would have been a pest to the country, but who [now are filling] situations in life and becoming useful members of society. The cost at which this amount of good [has been done] was very small, little more than $6 per annum; when he considered that criminals [are transported] at a cost of from $30 to $40 a year each, he [felt] astonished that the various ragged schools were allowed to remain in struggling circumstances.
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Native English teacher at Mister Micawber's

[Assile]

Dear Mister Micawber
Thank you very much for your help. I was happy with the answer because I need to know the answer to check it with mine. Thanks a lot Mister Micawber because I seek to improve my English and I am eager to succeed the national exam (we have it after getting the graduation) and to be an English teacher. You did a great favor for me.