Decode this picture on T-Shirt and tell what it says ?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

What's the only room from which no one can enter or leave

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

There is a shop where written:
Buy 1 for $1
10 for $2
100 for $3
I needed 999 and still only paid $3. How could this be financially viable for the shop-keeper?

Three ants are going up a hill, one behind the other. The last ant then says to the other ants, 'There is an ant behind me!'' How come?

Can you find the thief by just looking at the picture below?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?