Grammar: Put the bracketed verbs in the right tense

[Assile]

Put the bracketed verbs in the right tense

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

thank you

[Mister Micawber]

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_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber