What does below rebus means ?

How many words can a pen with half refill write?

What can you see in the middle of March and April that you can never see in any other month?

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?

How many minutes are there in Feb 2017?

Note: The shortest answer is the correct answer.

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

I am quite hot but become too cold if you remove the first two letters. What am I?

What part of the chicken has the most feathers?

I know a country, If you remove the last alphabet of its name, it will become a part of your body. Do you name it?

Forwards I am heavy, backward I am not. What am I?