What two things can keep us healthy?

A. A balanced diet and watching TV
B. A diet high in sweets and going swimming
C. Eating lots of fruit and vegetables and playing computer games
D. A balanced diet and exercise

The correct answer is D. A balanced diet and exercise. To arrive at this answer, let's break down the options:

A. A balanced diet and watching TV: While a balanced diet is beneficial for our health, watching TV does not contribute to our physical well-being. It is important to engage in physical activities to maintain good health.

B. A diet high in sweets and going swimming: Eating a diet high in sweets is generally not considered healthy, as it can lead to various health issues. Going swimming can contribute to our overall fitness, but it does not counterbalance the negative effects of an unhealthy diet.

C. Eating lots of fruit and vegetables and playing computer games: Eating plenty of fruits and vegetables is a healthy choice, as they provide essential nutrients. However, playing computer games does not contribute to our physical health.

D. A balanced diet and exercise: This option includes both a balanced diet and exercise, which are two key components for maintaining good health. A balanced diet ensures that we receive necessary nutrients, while exercise helps us stay physically active and fit.

Therefore, the correct answer is D - a balanced diet and exercise are the two things that can keep us healthy.