2.[{5-2}] pensarlas; -las refers to cosas. When an object, other than a personal pronoun or relative pronoun, precedes its verb, a corresponding personal pronoun-object is often used with the verb.
3.[{5-3}] De ... calle, with a bound I reached the street.
[Page 6.]—1.[{6-1}] el menor, the least possible.
2.[{6-2}] me iba serenando, I was becoming calm. Note the common use of ir as an auxiliary verb with the present participle to form a progressive tense.
3.[{6-3}] Acudió ... reflexión, I began to reflect (lit., reflection came to me).
4.[{6-4}] Pensaría; cf. [page 2], note 3.
[Page 7.]—1.[{7-1}] no ... hacer, nothing was left undone.
2.[{7-2}] larguísimo rato; note the omission of the article in many adverbial phrases.
3.[{7-3}] Que; this expletive que is usually omitted in translation, but here it may be rendered approximately by why.