Millions of pizzas are eaten (eat) in the world every year.

1 Millions of pizzas are eaten in the world every year. Миллионы пиццы съедают в мире каждый год.

2 How many emails are written every day? Сколько писем написано каждый денек?

3 Chocolate is sold in almost every country in the world. Шоколад продается практически в каждой стране мира.

The sentences are in Present Indefinite and they are in Passive voice.

Passive voice is used when the action is more important than the doer.

In Passive voice the subject isnt the doer of the action, subject takes the action on it. Passive Voice is formed with the help of to be + the third form of verbs.