What country can make you shiver?

What 5-letter word typed in all capital letters can be read the same upside down?

A sea diver is a real show-off. He showed everyone that he can hold his breath underwater for 15 minutes.

I went to the diver and told him that I can be underwater for double the time i.e 30 minutes.
He responded that he will give me 100$ if I would be able to do it. I won 100$.

What did I do?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

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

Why is the Hole below a Lock?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

When 99 is considered higher than 100?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

Which English verb becomes past tense just by rearranging the letters?