"その" is "that." "That library."
I certainly think so. Duo has most definitely counted it wrong before when I forgot and put "the" instead of "that" in similar situations.
it's very quiet in that library should be correct right?
"The library is so quiet" is not correct?
It is, this course is still in Beta. Japanese is also a very difficult language to teach in this format, so, allow for some error. You are correct, though
Isn't shizuka also a girl's name?
yee, like that girl in Doraemon