Sure! Here are the corrections for the sentences in Exercise 2 and the correct forms of the words for Exercise 4:

### Exercise 2: Correct the mistakes

1. Eating more fruit and vegetables **is** to get vitamins, minerals, **and** fiber.
Correct: **is** and **and**

2. Good nutrition is **an** important part of leading a healthy lifestyle.
Correct: **an**

3. Watch more television; **otherwise,** your eyes will be tired.
Correct: **otherwise**

4. I’ve drunk three glasses of beer, but I’ve got a **headache.**
Correct: **headache** (No correction needed if it is intended as a statement; however, if the sentence is about being tired after drinking, it could be rephrased slightly.)

### Exercise 4: Fill in the correct form

1. That’s a bad **cough**. Why don’t you have a glass? (COUGHING)
2. Rob has a **temperature** of 39.5 oC. (TEMPERATE)
3. Hundreds of thousands of people were affected by an **unknown** virus. (KNOW)
4. He never takes the doctor’s **advice**. (ADVISE)
5. Covid-19 is **different** from other existing viruses. (DIFFERENCE)

Feel free to reach out if you need any further assistance!