There is one mistake in each sentence. Underline and correct the mistake. 1. Sitting close to the laptop’s screen hurt your eyes.
2. You can avoid many diseases by eat healthy food.
3. You look so bad! How’s wrong with you?
4. Eating lots of fast food can make you fat or obesity.
5. Eating more fruit and vegetables to get vitamins, minerals, fiber.
6. Good nutrition is a important part of leading a healthy lifestyle.
7. Watch more television; if not, your eyes will be tired.
8. I’ve drunk three glasses of beer, but I’ve got a headache.

1. Sitting close to the laptop's screen hurt your eyes.

Sitting close to the laptop's screen hurts your eyes.

2. You can avoid many diseases by eat healthy food.

You can avoid many diseases by eating healthy food.

3. You look so bad! How's wrong with you?

You look so bad! What's wrong with you?

4. Eating lots of fast food can make you fat or obesity.

Eating lots of fast food can make you fat or obese.  

5. Eating more fruit and vegetables to get vitamins, minerals, fiber.

Eat more fruit and vegetables to get vitamins, minerals, and fiber. The word "and" is used to show the conclusion of the list of items in the sentence. If a sentence contains a list of simple items, separate each item with a comma. The words “and” or “or” should be used just before the last item to indicate the conclusion of the list. “And” is inclusive and means all of the items mentioned apply, whereas “or” indicates that only one of the items is relevant.  

6. Good nutrition is a important part of leading a healthy lifestyle.

Good nutrition is an important part of leading a healthy lifestyle.

7. Watch more television; if not, your eyes will be tired.

Watch less television; if not, your eyes will be tired.

8. I've drunk three glasses of beer, but I've got a headache.

I've drunk three glasses of beer, but I have a headache.

3and 4 and 5 are correct