B．since

　　C．when

　　D．while

　　2．Two centuries later，the Spanish had settled in most part of South America and along the northwest coast of ________ we now call the United States.

　　A．what

　　B．which

　　C．where

　　D．as

　　3．However，some survived these terrible times and today there are more Native Americans ________ in California than in any other state.

　　A．live

　　B．lived

　　C．to live

　　D．living

　　4．In more recent decades，California has become home________ people from Asia，including Cambodians，

　　Koreans，Vietnamese and Laotians.

　　A．with

　　B．about

　　C．to

　　D．at

　　5．________ in 1873，the cable car system was invented by Andrew Hallidie，who wanted to find a better form of transport than horsedrawn trams.

　　A．To be built

　　B．Built

　　C．Building

　　D．Having built

　　6．It suddenly opened everybody’s eyes to the possibility of using cloning to cure serious illnesses，and even ________ human beings.

　　A．produced

　　B．producing

　　C．to produce

　　D．produce

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