Read the passage and answer the questions from 37 to 40. Each answer must contain NO MORE THAN FIVE WORDS.

People across the country are being advised to wear face coverings in certain circumstances when out of the house, to help limit the spread of coronavirus. In England it is compulsory to wear one on public transport and from 24 July it will also be compulsory in shops. While medical face masks and respirators are prioritised for health and care workers, you might want to try making your own face covering, wherever you live. Here's our guide to different types and step-by-step instructions on how to make them. Whether you’re handy with a sewing machine, like cutting up old t-shirts or just want a quick fix, the principles are the same: the more layers of material the better, and the mask needs fitting snugly around the face, so you can breathe comfortably. One study  has shown that the best materials to use are tightly woven cottons or twill,            natural silk or quilted cotton material. But you can also make do with what you have around your home (Adapted from https://www.bbc.com/news) 

What are people advised to do to limit the spread of coronavirus?