Ответ:

с.81, №2

2.on, 3. at, 4. in, 5.in, 6.in, 7. in, 8.on, 9.on, 10.at, 11.on

с.76, №3

They're under the umbrella.

It's behind the tree.

It's near the board.

It's near lions.

с.78, №2

2.b, 3.a, 4. c, 5.b, 6.a, 7.b, 8.b, 9.c