Thanks for adding your answers. I am also a learner, but I hope I can explain your errors to help you.
10] kitaplıkta = on/in/at the bookcase
Kitaplıkta dört kitap var = There are 4 books in the bookcase.
kitaplıktan = from the bookcase
Kitaplıktan bir kitabı seçtim = I selected a book from the bookcase.
11) Siz dün tiyatro .... git...... ?
If we see the subject is siz, then the verb at the end must agree with the subject. So it has to be gittiniz mi ?
I guess you know the rule that when a suffix starts with a vowel, it needs a buffer letter to join a word ending with a vowel
tiyatro + a/e (to the theatre)
= tiyatro+y (buffer letter) + a (for vowel harmony)
= tiyatroya (to the theatre)
Siz dün tiyatroya gittiniz mi? (Yesterday, did you go to the theatre?)
12) Yemekler güzel miydi? (Was the food nice?)
which is different to .....Yemekler güzel mi? (Is the food nice?)
Evet harika.....
The question indicates past tense of the old Turkish verb for ´to be´. (imek)
imek (not used these days) = to be
idi = it was
so the answer must also say ´it was´ (idi)
harika + idi (needs a buffer, so the i mutates to a y) to become
harika + ydı = harikaydı = it was fantastic
hasta (sick), hastayım (i am sick), hastaydım (I was sick)
see more explanations here
The same happens for the with suffix (ile)
Araba + ile = arabayla (by car, with a car)