Olá Cristina! I made some corrections/suggestions. I hope they help! Nice job!
Andy

Het eten

Ik eet vijf maaltijden per dag. Ik ontbijt om half acht 's ochtends. Ik eet meestal melk met granen. Ik heb liever bessen granen.

We hebben een snack op de universiteit om half twaalf en het kunt een fruit, en kleine boterham of zelden zoete koekbakkerij zijn.
We eten een snack op de universiteit om half twaalf. Het kan een stuk fruit, een kleine boterham of soms een zoete koek zijn.
We eten een snack op de universiteit om half twaalf. Het kan een stuk fruit zijn, een kleine boterham of soms een zoete koek.

Voor lunch hebben we honderden verschillende recepten. Maar één van mijn favorieten is zalm met gebakken groenten.
Rond 6-7 uur 's avonds eten we "merienda", andere snack die voor mij meestal een fruit is.
Rond zes à zeven uur 'avonds eten we "merienda". Voor mij is dat meestal nog een fruitig tussendoortje.
Rond zes à zeven uur 's avonds eten we "merienda", nog een tussendoortje. Voor mij is dat dan meestal een stuk fruit.

Ik hou van watermeloen.
Om 22 uur vandaag heb ik een groentesoep en één kippendij gehad/ gegeten.

In Spanje avondeten we te laat.
In Spanje eten we laat op de avond.
In Spanje is het avondeten laat.
In Spanje dineren we laat.

Hello! I made some corrections! I hope they help!
Andy

I am an English learner.

HI everyone. I am from Hanoi. It is the capital city of Vietnam. I am 20 years old and my major is environmental engineering technology.

I want to contact with people in the world.
I want to talk with people from all over the world.
I want to contact people from all over the world.

English is funny.
English is fun.

Hi Abdullah, I made some corrections. Good job!
- Write a capital I, not an i, even in the middle of a sentence. I hope, I think, Today I am going...
Andy

About Pakistan

Hello everyone! My name is Abdullah. I am 20 years old and I am from Pakistan. Today I am going to tell you about Pakistan and the people of Pakistan. Most of the people (from all over the world) think that Pakistan is not a good country and people from here are terrorists. But it is not true. Pakistan is also a good country and people of here are also very good. We like to meet new people. Some people who came from Afghanistan are not good. They are called terrorists. I just want to say we are also good like other. as good as other people... If you ever get a chance then you must come to Pakistan. I hope you will never forget that love which the people of here will give you.... I hope you will never forget the love people here will give you.
Thanks for giving your precious time.

Hi Adrienn, I've made some corrections. Nice job!
Andy

About Sherlock Holmes

Sherlock Holmes is one of the most famous characters in the literature. He is the favourite character of thousands, maybe millions of people, mine too. He appears in Sir Arthur Conan Doyle's novels and short stories.
With his words he is a consulting detective (the first in the world and in his age the only one) who helps to solve other people's problems. It doesn't matter who asks help from him him for help. He helps to everyone, for example, from poor people and also to the king of Bohemia. Money doesn't matter to him. The joy of solving complicated mysteries is the most important to him.
He has a friend and a "biographer" Dr. John Watson. Dr. Watson was a military surgeon in Afghanistan and after he returned to London, he met with Sherlock Holmes who looked was looking for a roommate for his flat. After this they became friends and he accompanies Sherlock Holmes often on his adventures.

Hi Dmitry, I made some corrections!
Andy

Sherlock Holmes

Sir Arthur K. Doyle is one of the most famous writers who wrote detective fiction. There were many writers that worked in this genre of literature, for examples Agatha Christie, Edgar Allan Poe and other famous authors of detective fiction. However Sherlock Holmes is my favorite character.
In books about Sh.Holmes, the author described Holmes as someone who was very observant. He had an amazing mind abilitie and an ability to dissect facts and find decision ways out  of most difficult and entangled situations.
He called himself the Consulting Detective and he took only difficult cases which were refused by Scotland Yard and private agencies.
Sometimes he ran into conundrums during an investigation which confused him at the beginning of the case. The more difficult the crime is, the more interesting is his work. The more difficult the crime, the more interesting his work is.
There's always an assistant of the protagonist in all stories. It's not an exception to the rule. The assistant and also the best friend of Holmes is Dr. John Watson. He wrote a story about a friend of his in his spare time.
He devoted his entire life to the  detective work. During his career as a detective he has solved more than a thousand crimes, which helped a of lot people and saved a many lives. ...(saved many a life.)
The stories about Sh.Holmes remain very popular until this day. Arthur K.Doyle was sent a lot of angry letters, when he wanted to finish the story about Sherlock Holmes by death. After that he decided to continue the story about the detective.

Hi Tetsu, I made some corrections. I hope they help you!
Andy

Smoking

I discussed about Smoking with my teacher today.
I talked about smoking with my teacher today.
I discussed smoking with my teacher today.
I discussed the habit of smoking with my teacher today. (less confusing)

Both I and he hate smoking because of the bad smell.
Both he and I hate smoking because of the bad smell. (courtesy to put "he" first)

When I 'm with my friends who smoke a lot, my suits or clothes easily absorb the disgusting smell of smoke.
The Tokyo metropolitan government is trying to make smoke free places by banning smoking from the 2020 Olympics in Tokyo.
I also hope for a better environment for all people around the world.

Hi Aailiyah! I've made some corrections. Nice job!
Andy

English Learning

It is so important that students are good at English. well.
It is so important that students speak English well.
Due to,in the contemporary world,it is significance for students to learnEnglish well and thus.English learning has gained great popularity.
Due to its significance for students in the contemporary world, learning English has gained greatly in popularity.
Due to modern times, it is significant for students to learn English well; thus learning English has gained great popularity.

Based on a survey, a host of international organizations or and firms acknowledge that they prefer recruiting employees who can speak English fluently.