Calcium permits cells to divide, regulates muscle contraction and relaxation, and plays an important role in the movement of protein and nutrients inside cells besides helping ______ .

填空题If you want to have strong bones you should eat food ______ .

填空题Fruits, such as watermelon, red grapefruit, and guava, are now exciting the interest of researchers because ______ .

填空题A study shows that men who eat tomato products twice a week could probably avoid developing prostate cancer by one third in comparison with those ______ .

填空题Investigators don’t ______ how many phytochemicals exist and how they work.

填空题Researchers say that supplements can completely take the place of real food in the near future.