1) was twenty degrees in the shade -There
-It
2) were no clouds in the sky
-There
-It
3) was nothing left to do
-There
-It
4) was no time for tea if we are in a hurry
-It’s
-There is
-Оба варианта возможны
5) was nothing to be seen, was too dark
-There, it
-It, there
-There, there
-It, it
6) were many people in the room
-There
-It
7) some pencils in the box
-There is
-There are
8) a bear in the cage
-There is
-There are
9) a book on the table
-There is
-It is
10) no toys in the room
-There is
-There are
11) no milk in he jug
-There is
-There are
12)Is a Zoo in the city?
-There
-It
it
there
there
there is(?)
there,it
there
there are
there is
there is
there are
there is
there