a lot of - all - most of the

Most of the students in this class like dogs.
Most people like pizza.
Most of the people like pizza.  (incorrect, because is not especific)
Most of the people in my country are hardworking. (in my country = specific people)
Most of my holidays were amazing! ( my hokidays = specific)
All people need to hold a cute puppy once in their life.
Most of the teachers in my school want to kill me.
All of the  teachers in my school want to kill me.
Most of the students who I have met like to drink alcohol.
A lot of the students who I have met like to drink alcohol.

specific information need: of the

Much of the news from my country is accurate.
(news is uncontable)

All life is important.
All kids love cartoons. All kids in the world.
All of the kids who I know love carttons. Specific kids.
All of the teachers at my school are crazy.
All of the shoes which I got are cool.

Look at the following sentences. Which sentences are correct? Why?
Much of the news in my country is depressing.
Many of the news in my country is depressing.
A lot of the news in my country is depressing.
many is incorrect

plural
A lot of the students in my country like to study language.