语法填空 It was my first time visiting the United States. Before ___1___ (leave) for Washington D.C., I downloaded some introductions about some tourist __2__(attract) in the city. Therefore I knew something about this city before the trip. A lot of things happened during my trip to Washington D.C.. However, __3___ impressed me most is the International Spy Museum, which I visited on the __4___(three) day of the trip. In my spare time, I often watched movies about spies with my parents because I was __5___(extreme) interested in spies. I acquired __6__ good knowledge of that after I read the descriptions in the museum. I learned that spies usually hid important letters in an umbrella, in a shoe, or even in a pair of ordinary __7__(glass). When they thought they were probably found out, they could have their appearances ___8___(change) in a few minutes. They put on fake hair, eyes or teeth. If they had an emergency, they even changed a smaller pair of shoes to change their walking styles in order not to _9___(recognize). __10__ conclusion, it was a nice trip. I had a good time in Washington D. C.. I will remember this trip forever.