1. A. In
* We say "in" a country. For example, "in Vietnam," "in the United States."
2. D. are
* Since we're talking about a general fact about many people in the present, we use the present tense, "are."
3. A. too many
* "Too many" is used to describe a quantity that is more than is wanted or needed. It's used with countable nouns like "food."
4. A. but
* This word shows a contrast between the healthy snacks (fruits and vegetables) and the unhealthy snacks (junk food).
5. B. lead
* "Lead to" means to cause something to happen. Eating junk food can cause weight gain.
6. D. because
* This word introduces a reason. People gain weight because they don't exercise.
7. D. energy
* People need energy to function.
8. D. feel
* When people exercise, they feel more energetic.
9. A. live
* "Live" means to have a life. A good diet and exercise help people live a long and healthy life.
10. D. healthy
* A healthy life is a life that is free from illness.