Complete the task. Read the text below. Transform the words (if it is necessary) in brackets in capital letters so that they match the content grammatically. Fill in the gaps using full passive forms of the verbs.
Write one, two, three or four words in each gap.
Ayurveda, or Ayurvedic medicine, is a system for healthy living that [ ] (USE) by people in India for more than 5,000 years. Ayurveda emphasises good health and prevention and treatment of disease through lifestyle practices (such as massage, yoga, meditation, and diets) and the use of herbal remedies.
In the West, Ayurveda [ ] (APPLY) as a complementary therapy alongside conventional medical care. A few studies and trials have suggested that its approaches are effective, but there are concerns about the safety of Ayurvedic medicines. Sold largely as food supplements, the presence of metals in some makes them potentially harmful. It [ ] (FIND) in a 2004 study that 20 percent of 70 Ayurvedic medicines produced by 27 South Asian manufacturers contained toxic levels of lead, mercury, and arsenic. So Ayurvedic medicines [ ] (SHOULD/SUPERVISE) by a trained practitioner. Let's hope that the problem with the presence of toxic metals [ ] (SOLVE).