77-7: a sus solas: all alone. For a similar idiomatic plural, cf. de veras, and (on p. 4, line 31) con todas las veras.
77-8: que daba asco: (such or so) that it inspired disgust. Que is often elliptical.
78-1: vas a echar un siglo: it will take you forever.
78-2: componértelas: to take the proper measures; to go about a thing; to manage.
78-3: divertido: cf. note olvidado, p. 31, 1.