What does the below image rebus riddle means ?

I come in different shapes and sizes.
Parts of me are curved, other parts are straight.
You can put me anywhere you like,
but there is only one right place for me.
What am I?

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

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

A Doctor always sneezes before the rain. Doctor sneezes, Will it rain?

Quickly Solve this riddle

7 - 4 + 3 * 0 + 1 = ?

There's one "sport" in which neither the spectators nor the participants know the score or the leader until the contest ends.

What is it?

What part of the chicken has the most feathers?

If there are fifteen crows on a fence and the farmer shoots a third of them, how many crows are left?

A very interesting trivia question for all.

Why do men's shirts have their buttons on the right side and women's have buttons on the left-hand side?