阅读理解 Complete the following sentences. For each blank use ONE OR TWO WORDS from the passage.

填空题 6.Now most people live in______cities where the sky looks as though it has been emptied of stars, leaving behind a vacant haze.

填空题 7.According to a recent study, well-lit streets do not______or make neighbourhoods safer to live in.

填空题 8.Efficient lights______from going into areas where it is not needed.

填空题 9.In dealing with light pollution______is at least as important as passing new laws.