Solution:

The hidden cat is encircled below.

Solution:

If you see the picture, they formed a pentagonal shape and achieved the required.

Solution:

"World War I" was named after after "World War II"

Solution:

   9567
+ 1085
======
 10652

Solution:

They are matched as shown in the picture below.

Solution:

The man asked the king that he wanted to die of old age.

Solution:

It can be done as shown in the picture below.

Solution:

19

Explanation:
The children can purchase 19 chocolates in return.

Out of 77 wrappers, 75 will be used to buy 15 chocolates and two will be left spare.
The 15 chocolates will create 15 empty wrappers that can be exchanged to get three chocolates.
Three chocolates will return three wrappers which will help them buy another chocolate.
Now the wrapper from this chocolate and the two spare that were left earlier will get them another chocolate.
15 + 3 + 1 = 19

Solution:

7, 4, 6, 5, 8

Solution:

I filled a glass full of water and held it over my head for 20 minutes.

Solution:

1/36

Explanation:
The number of possibilities for the first as well as the second dice are 6 and 6 respectively. Therefore the total possibilities or outcome are 6 * 6 = 36.
Out of 36 outcomes, we need only one case i.e. the first gives 2 and the second gives 5.
Therefore, the probability will be 1 on 36 or 1/36.