Questions: Highlight all the sentences in this paragraph that should include quotation marks. The word vegetarian means someone who eats only vegetables and fruits, grains, nuts, and, in many cases, eggs and dairy products. A vegetarian diet has many health benefits. Dr. Smith says, "A meat-free diet will lower the chances of cardiovascular disease and a number of different cancers." He argues, "This decrease in risk is due to the lowered intake of saturated fat and cholesterol coupled with a higher intake of fiber and cancer-protective phytochemicals." In addition, a vegetarian diet can help in the maintenance of a healthy weight. The combination of lowered disease risk and healthier weight maintenance leads to many other related health benefits ranging from higher levels of energy to overall greater longevity. Numerous statistics show that people with vegetarian diets tend to live longer than their meat-eating counterparts.

To determine which sentences in the paragraph should include quotation marks, we need to identify direct quotes from Dr. Smith. Quotation marks are used to indicate the exact words spoken or written by someone else.

Here is the paragraph with the sentences that should include quotation marks highlighted:

『(1) (i) Instructions

The word vegetarian means someone who eats only vegetables and fruits, grains, nuts, and, in many cases, eggs and dairy products. A vegetarian diet has many health benefits. Dr. Smith says, "A meat-free diet will lower the chances of cardiovascular disease and a number of different cancers." He argues, "This decrease in risk is due to the lowered intake of saturated fat and cholesterol coupled with a higher intake of fiber and cancer-protective phytochemicals." In addition, a vegetarian diet can help in the maintenance of a healthy weight. The combination of lowered disease risk and healthier weight maintenance leads to many other related health benefits ranging from higher levels of energy to overall greater longevity. Numerous statistics show that people with vegetarian diets tend to live longer than their meat-eating counterparts.

The sentences that should include quotation marks are:

1. Dr. Smith says, "A meat-free diet will lower the chances of cardiovascular disease and a number of different cancers."
2. He argues, "This decrease in risk is due to the lowered intake of saturated fat and cholesterol coupled with a higher intake of fiber and cancer-protective phytochemicals."

These sentences are direct quotes from Dr. Smith and therefore should be enclosed in quotation marks.