What does this rebus riddle means ?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

When I got four, I have it none.
When I got two, I have it some.
When I got none, I have it all.

What is it?

A Club organizes a Running Race, and John, Jacob, Minda, and Tony participated.

The results are as follows

John beats Jacob
Minda beats Toni
Toni beats John

Who came first in the race?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

Decode below three cipher riddles:

26 L of the A
7 D of the W
1000 Y in a M

Which flower has two lips?

What is the end of everything?

In a contest, four fruits (an apple, a banana, an orange, and a pear) have been placed in four closed boxes (one fruit per box). People may guess which fruit is in which box. 123 people participate in the contest. When the boxes are opened, it turns out that 43 people have guessed none of the fruits correctly, 39 people have guessed one fruit correctly, and 31 people have guessed two fruits correctly.
How many people have guessed three fruits correctly, and how many people have guessed four fruits correctly

The more it dries, the wetter it becomes. Can you tell what it is?