Sure, here are the completed sentences:

**IX. Complete the sentences using the words in the boxes.**

1. Some people can’t avoid fatty foods, so it is challenging for them to **maintain** healthy weight.
2. I always take a short **nap** after lunch to boost my energy in the afternoon.
3. The **cafeteria** in my school has different food options for students.
4. Drinking a lot of soda can increase the **risk** of many health problems, including obesity.
5. Many children are **addicted** to fast food and sugary drinks, which causes their weight gain.

**X. Complete the sentences with the correct forms of the words in brackets.**

6. These days, the rate of **obesity** is becoming high among young people.
7. I used to be a book **addict**. I couldn't go a day without reading.
8. Before going to bed, Mia always applies **nourishing** cream to her skin.
9. Eating raw seafood can be quite **risky** if it is not prepared properly.
10. The goal of our organization this year is to **promote** health among school students.

**XI. Complete the sentences with although/though, in spite of/despite, or because/because of.**

1. Although he is slim, Josh still exercises every day.
2. My health improved a lot **because of** my recent diet change.
3. Although knowing fast food is very harmful, we still eat them very often.
4. Liam can’t manage to play any sports **because** he knows it is good for his health.
5. I chose to practice meditation daily **because of** its good effect on my mental health.

**XII. Circle ONE mistake in each sentence and correct it.**

1. In spite of a diet, Susan could not stop herself from eating a pizza at the party.
- Mistake: In spite of -> Despite being
2. Although Tim knows the risks of lack of sleep, but he still stays up late playing online games.
- Mistake: but -> (Remove)
3. Although Ana attends a fitness program she follows its, my sister still gains weight.
- Mistake: follows its -> follows it
4. Although most people know that we keep eat junk food.
- Mistake: keep -> keeps
5. Many people know they should put on sunscreen before going out in the sun, many people still forget to do it.
- Mistake: many people still forget to do it -> they still forget