iver turns the handles __6__(go) left or right.the segway has computers and gyroscope devices to make __7__ move and balance.it is powered by batteries that can be recharged in a few hours by __8__(use) an electric outlet.it can travel at a speed of nineteen kilometers per hour.it costs less than ten cents a day to operate.it does not produce pollution.mister kamen says the segway could replace cars in __9__(crowd)city centers.he says it was designed to reduce pollution and solve other __10__(environment)problems in cities.however，it was not designed to travel on roads.
1．解析：关系代词which引导非限制性定语从句。
答案：which
2．解析：介词短语作定语，表示“带两个轮子”。
答案：with
3．解析：动词不定式作宾补。
答案：to hold
4．解析：定冠词特指stick上的handles。
答案：the
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