The key to exercise solutions in chapter 5b - Vocabulary for the textbook On Screen B1+ - Student's Book with authors Virginia Evans and Jenny Dooley from Express Publishing
1) The emergency services respond to accidents and emergencies.; 2) You need complete darkness to see all the stars at night.; 3) Lightpollution is a big problem these days.; 4) Many car parks leave lights on at night.; 5) Security lights also cause a lot of light pollution.; 6) When office blocks turn their lights off at night it helps birds.; 7) The lights from seafront hotels affect turtles in some areas.; 8) Too much light at night can affect your sleep patterns.; 9) Heart disease is a serious side effect of lack of sleep.; 10) I love to look at starry skies at night.