1.) The company probably doesn't actually possess 5 billion dollars in cash. I think what you want to say is "They have over 1000 employees and are worth 5 billion dollars." "Has became" is not proper. Use "has become." This tense means something happened in the past and continues to the present. It is also improper to start a sentence with "so." In formal English, so is used as a conjunction to connect two sentences together. "It has become a top-200 world company." 2.) If you want the focus to be on the action of adopting, say "I like pets, so I have adopted a cat." If you want the focus to be on the cat, say "I like pets, so I have an adopted cat." You could use "one," but it sounds unnatural. You would use "one" as part of a list (I have two apples, one banana, and three oranges) or in response to the question "How many do you have?" (How many cars do you own? - I only have one car) 3.) No problems here

1) The ABC Company is well-known around the world. They have over 1000 staff and possess $5 billion in cash. So it has already became Top-200 world entrepreneurial company. - a few changes here, but all-in-all a good sentence. 2) I like pets, so I have adopted one cat. Her name is Mimi. - switch 'adopted' and 'one', it sounds more natural this way; also use the gender pronoun instead of 'its' 3) I ate an orange and an apple 10 minutes ago. - this one is perfect. Hope these help. ~Samantha :)