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May I ask you a question about the difference between <s>different</s> "left" and "rest"?

For example, when I go <s>went</s> to a <s>the</s> restaurant and I'm already full. 
That time, could I have said <s>can I say</s> to a staff member <s>stuff</s> of the restaurant <s>that</s> ...? 
1. “Can <s>Could</s> I get the rest of this to take home?” 

  (You would say the 1st one)
  (You can also use left in this situation with some rewording, but it is more common to use rest)

Another one,

I came back to bring a dog who was abandoned by <s>to</s> someone home, but I couldn't keep <s>do</s> it as a pet because my mother wouldn’t <s>didn't</s> permit it. I can't help it. 
Then I brought the <s>put</s> <s>a</s> dog to the park. 
That time, could I have said <s>can I say</s>…

1. It <s>I </s>seemed that the rest of the dogs felt sad. 
2. It <s>I</s> seemed that the dog who was left in the box felt sad . 

(Either can work in the situation)

Another one,

when I had to <s>have</s> prepare<s>d</s> <s>a</s> dinner, I checked the <s>a</s> fridge but there wasn’t much <s>is</s> <s>seldom</s> food inside. 

 (Seldom in this case is a bit awkward)
That time, could I have said <s>can I say</s>...? 

2. I prepared <s>a</s> dinner using the leftover food in the fridge.

  (or “I prepared <s>a</s> dinner using the food left in the fridge.”)

 (Once again, you can also use "rest" in this situation with some rewording)

 Overall, I think that the difference between “left” and “rest” is simply the syntax of "the sentence. "Rest" is usually "the part that is left or remains; the remainder". "Left" is usually "to allow to remain in the same place, condition, etc". Sometimes the sentence is easier to construct using “left” {Example 3} and other times “rest” is easier to use {Example 1}. 

I hope this helps, sorry if it didn't.

Shears

Certificate Craze (CET6)

In recent years, there are a large number of people who are addicted to getting a variety of certificates*. This situation is out of control. Denser and denser classes have been built and they never afraid of nobody coming**. 
The people who want to get different kinds of certificates have their own reasons. Some of them want to have a good job, while others just think of developing themselves. There are still some people only studying to have fun. They prefer learning new skills to staying at home.
In my opinion, people should choose the useful classes to learn. Learning a new subject would take a lot of time. Once you have decided to learn a new skill, you should have the determination to learn it very well.

*Are you talking about a degree or a certificate? The difference is that a degree is higher than a certificate and takes longer to obtain and required more knowledge.

**I understand the 1st part, however, I'm confused by the end.

Good job though, even with a few mistakes I was able to understand the majority of it.