Tom is a l{#blank#}1{#/blank#} boy. Yesterday he learned many English words. He wanted to remember them {#blank#}2{#/blank#}(quick). He only read them once, so he couldn't remember them {#blank#}3{#/blank#}(exact), because many words had many l{#blank#}4{#/blank#}. In f{#blank#}5{#/blank#}he should learn hard to remember them.

    Have you ever seen a hitchhiker (搭便车的旅行者) {#blank#}1{#/blank#} (stand) by the side of a road? Now drivers in Canada might see an unusual hitchhiker: a hitchhiking robot.

    One of its {#blank#}2{#/blank#} (invent), David Harris Smith, has hitched across Canada three times. Smith and a friend, Frauke Zeller, have built Hitchbot because they wanted {#blank#}3{#/blank#} (see) if people would stop and give the robot a lift and talk to it. The robot {#blank#}4{#/blank#} (chat) about things it had learned, and about {#blank#}5{#/blank#} (it) trip. You might think it's a joke, but Smith and Zeller's experiment has a serious point: can robot and people get along?

    Hitchbot {#blank#}6{#/blank#} (begin) its journey in Nova Scotia in July. It has already completed one {#blank#}7{#/blank#} (three) its 6, 000-mile trip to Victoria. More than 57,000 people are following its journey closely on Facebook and Twitter, and travelers have posted lots of photos on the websites. Hitchbot {#blank#}8{#/blank#} (do) some shopping, eaten motor oil and had fun with travelers. Nobody {#blank#}9{#/blank#} (know) when it will finish its journey. It might be longer than expected, but Zeller and Smith want Hitchbot to get as {#blank#}10{#/blank#} (many) rides as it can. It hasn't been in a self-driving car yet, but anything is possible!