Read the text and complete the sentences.

Choose the correct answer.

One way to calm **** [down|up|over|with] when you are [over|in|under|on] stress is to spend more time outdoors. Research has shown that the vitamin D boost from sunlight can [strengthen|increase|rise|expand] levels of feel-good serotonin. And spending time in nature is simply good for your mental health. "Getting outside is a way to restore emotional balance," says Alicia H. Clark, psychologist and author of Hack Your Anxiety. "Spending time outdoors is not only a change of scenery and an [possibility|chance|occasion|opportunity] to get out [off|of|from|on] your own four walls, but it can also be a great way to relieve stress and anxiety."