jego

1. his: possessive pronoun of on
2. its: possessive pronoun of ono

przecież

used to introduce a new, conflicting fact, but; after all

trzeba

1. expresses the goodness of the following verb; it is needed, one ought to [+infinitive]
2. expresses the naturalness or obviousness of the following verb; ought to, must [+infinitive]
3. expresses the necessity or obligation of the following verb; it is needed, one ought to [+infinitive], [+dative = for whom], [+genitive = what is needed]

załatwić

1. to take care of, to deal with, to get done
2. to arrange, to set up for someone [+dative = for whom]
3. (colloquial) to take care of, to deal with, to kill
4. (colloquial) to do one's business, to defecate, to urinate