They are both national libraries and have been around for a long time.
It’s 3 because they are telling you to put the table then someone else says “don’t put it” which is no la pongas
<span>Él es un compañero de clase is the right answer. The 1st sentence is ella but </span>compañero should be compañera. In the second one ella should not have an accent mark and in the last one el doesn't match with una.
Answer: Están ocupados los martes.
Explanation: They are busy on Tuesdays.