What does this simple rebus mean?

Solve the following series:
AZ, GT, MN, __, YB

James ordered a fishing rod, priced at $3.56. Unfortunately, James is an Eskimo who lives in a very remote part of Greenland and the import rules forbid any package longer than 4 feet to be imported. The fishing rod was 4 feet and 1 inch, just a little too long, so how can the fishing rod be mailed to James without breaking the rules? Ideally James would like the fishing rod to arrive in one piece!

What English word has three consecutive double letters?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

When is the top of a mountain similar to a savings account?

What does below Rebus mean ?

esgg sgeg gegs gsge

I look flat, but I am deep. Hidden realms I shelter. Lives I take, but the food I offer. At times I am beautiful. I can be calm, angry, and turbulent. I have no heart but offer pleasure as well as death. No man can own me, yet I encompass what all men must have. What am I?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?