This is from the Institutio Puerilis of Marc Antoni Muret (1526-1585); you can read the book at GoogleBooks.
Nil facito, quod turpe putes fecisse videri,
Et cura, ut multis tibi sis pro testibus ipse.
The vocabulary is keyed to the DCC Latin Vocabulary list. All the words in this poem are on that list:
cūrō -āre: care for (+ acc.)
faciō facere fēcī factum: do, make
ipse ipsa ipsum: him- her- itself
multus -a -um: much, many; multō, by far
nihil, nīl: nothing; not at all
prō: for, on behalf of, in proportion to (+abl.)
putō -āre: think, suppose
qui quae quod: who, which, what / quis quid: who? what? which?
sum, esse, fuī: be, exist
testis -is m.: witness
tū tuī tibi tē: you (sing.)
turpis -e: ugly, unsightly; disgraceful
ut, uti: as (+ indic.); so that, with the result that (+ subj.)
videō vidēre vīdī vīsum: see