What is so fragile that saying its name breaks it?

An apple seller is hosting a competition. He offers 1000 apples and 10 boxes to the people who pass by. The challenge is to put those 1000 apples in the 10 boxes in such a manner that if he asks for any amount of apples, the person can directly give him the boxes or a combination of boxes. If the person can do it, he promises to give a thousand apples for free.

If you happen to pass by the apple seller, will you be able to win a thousand apples?

As easy as you can get into me, it is as hard to get out of me.

Do you know what I am?

Two boys wish to cross a river. The only way to get to the other side is by boat, but that boat can only take one boy at a time. The boat cannot return on its own, there are no ropes or similar tricks, yet both boys manage to cross using the boat.

How?

Which digit occurred maximum times between the number 1 and 1000?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

You have 1023 apples and 10 bags. You have to distribute these apples in these 10 bags in any way you choose. But when I ask for a certain number of apples you have to give them in terms of bags without transferring the apples from other bags. How do you distribute the apples?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

Make a sentence consisting of three words that have the whole alphabet.