Sticlă: 2 meanings, bottle and glass. As in English "glass" has also 2 meanings, the material itself and the drinking container. Romanian, even though it's basically a Romance language, it has a multitude of words with Slavic roots. The material of glass is called "staklo" in Serbian. Meanwhile, "cup" in neighboring Ukraine it's called чашка (ceașca), or "pehar" in Serbian. Glass (the drinking container) is čaša (ceașa) in Serbian...
"Sticla" literally means "Glass" and is colloquially used to also mean "Bottle". The popup hints only said "Bottle" which would be misleading to the student.
I read this to my girlfriend and she used the word "glass" without giving it a moments thought.
As for construiesc === construct ... I don't know about that, but I did use that word and got marked wrong.