Like all the huge metropolises of the world, there are lots of diversions both outdoors and indoors. The Art Institute of Chicago has one of the world's 　1　art collections, including more French Impressionist paintings than even in the Paris Louvre itself. The Field Museum of Natural History and the Museum of Science and Industry are also great historical and cultural treasure houses to 　2　as well as entertain children and adults 　3　. In the Field Museum one comes 　4　 a surprisingly big collection of Chinese exhibits from the ancient 　5　to the early century. The Sears Tower and the Buckingham Fountain are the pride of the Chicagoans; 　6　having 110 storeys is said to be the highest tower in the world and the 　7　is the largest fountain in the United States. Lake Michigan is for yachting in summer time. 　8　the highlights of Chicago life all the year round are concerts, operas and plays 　9　by the city's orchestra, opera houses and theatres. In summer, especially around the Independence Day, July 4th, many festivals and fairs are given outdoors, which 　10　crowds and crowds of people, with their parades, fireworks, 　11　concerts, water-skiing and good foods.
　　But with all its attractions and beautiful spots Chicago is also a city 　12　for crimes. All the dwelling houses are 　13　with three doors and visitors have to speak through microphone 　14　 in the wall to the residents before they call get admitted. In the streets there are white-color telephones. When one finds oneself 　15　, he needs only to knock the receiver 　16　the hook and the next instant the police will 　17　. If one does not drive a car, it may well be dangerous for him or her to go out alone in the evening. At first I did not take this warning seriously. 　18　, my two encounters with the Black people 　19　dusk in the neighborhood were so unpleasant and frightening that I have 　20　shut myself evenings in my room, in almost all studying, imposing a curfew on myself.
______

A.since 

B.then

C.after 

D.until