Sure! Here’s a suggestion for completing the passage based on standard grammatical choices:

My grandparents **(1)** live in the countryside and have a big garden. They spend a lot of time working on it. When I visit them in summer, I often join them in the garden, and they teach me a lot of things about vegetables. Vegetables come in different shapes, sizes, and colors. They also grow **(2)** carrots and potatoes, ginger and onions. We even have some beans. Some kinds of beans need a high net to grow. Cabbage and cauliflower grow even the season. My grandfather says that colored vegetables are rich in vitamin C. Orange carrots and red tomatoes contain vitamins A. People say vitamins help keep **(3)** healthy. My grandfather also says that gardening is a good way of exercising. It helps him keep **(4)** strong.

1. A. live
2. C. but
3. A. healthy
4. D. strong

Feel free to adjust the choices based on specific context or requirements!