What does this rebus puzzle means ?

Can you name some countries which do not have the alphabet 'A' in them?

What do you think with the below Picture ?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

A seven-year-old kid challenged his classmates that he can make the number one disappear by adding something to it.

How can he do that?

A plane crashed between the border of Mexico and America. Where do you bury the survivors?

I go up and I go down.
I go up towards the beautiful sky and down toward the green ground.
I am present tense.
I am past tense too
Children love me.

Who Am I?

What is wrong in the below Picture?

It's pretty hard to give up.
If you remove a part of it, you will be left with a bit.
Even if you remove another part, the bit still remains.
Remove one more and it still remains.

What is it?

Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?