根据语境，用方框中所给短语的适当形式填空。（每个短语仅使用一次）

Touring Cenotes

    My parents and I traveled to Mexico to visit my grandparents last summer, and we visited the cenotes (say-NO-tays), the natural swimming holes located on the Yucatán Peninsula. The term "swimming hole" might make you think that cenotes are just average, but cenotes are truly {#blank#}1{#/blank#}. I had the most exciting experience of my life exploring these wonders of nature.

    Thousands of years old, the cenotes formed and created sinkholes underneath. Though the ancient Mayans (玛雅人) used the cenotes as water {#blank#}2{#/blank#}, people can now swim, dive, take photographs, and admire local trees and {#blank#}3{#/blank#} life, all through water as clear as liquid diamond.

    In Cenote Azul, my parents, my grandparents, and I swam through water that seemed too blue to be real. I {#blank#}4{#/blank#} countless younger kids diving into the water from a small cliff, but I dared not to jump at first. I finally worked up the courage, and my {#blank#}5{#/blank#} try instantly put all my worries to rest.

    A few days later, we went to Cenote Ponderosa. We stayed in the sun-covered pond, where we {#blank#}6{#/blank#} floated while others did diving and took underwater photographs. Being surrounded by a valley of trees made everything else in the world seem to disappear.

    Grutas de Loltún were definitely the most magnificent of all the cenotes, even though there was no swimming involved. Grutas are caves, and the Grutas de Loltún are among the biggest caves on the entire Peninsula. Our guide, Carolina, walked us through several caves, where we saw many drawings thousands of years old on the cave walls! Just one brief look at those drawings made me feel like I had stepped back in time to a(n) {#blank#}7{#/blank#} era of history. Our group thought Carolina was joking when she claimed she could make the stalagmites(石笋) sing for us, but when she {#blank#}8{#/blank#} them, we heard what sounded like the words "Lol" and "Tun"—the name of the caves! I cannot imagine that a(n) {#blank#}9{#/blank#} played at a concert at Carnegie Hall would have been any better.

    Mexico's Yucatán Peninsula is filled with beauty, but the cenotes are a one-of-a-kind opportunity to commune with nature in a way that is impossible anywhere else on Earth, and I would not {#blank#}10{#/blank#} to do it all again.

    The Internet has been found a new usage. Increasingly, more and more Americans are having a(an) {#blank#}1{#/blank#}to become their own doctors, by going online to order home health tests or medical devices, or even self-treat their illnesses with drugs from Internet pharmacies(药店). Some people{#blank#}2{#/blank#} doctors because of the high cost medical care, especially if they{#blank#}3{#/blank#} health insurance. Or they may{#blank#}4{#/blank#} to see a doctor because they find it embarrassing to discuss their weight, alcohol consumption or couch potato habits. Patients may also fear what they might learn about their health, or they distrust physicians because of {#blank#}5{#/blank#}in the past. But to become their own doctors can be{#blank#}6{#/blank#}.

    Every day, more than six million American search the Internet for medical answers. Most of them have no{#blank#}7{#/blank#} about what they find. In 2002, a survey by the Pew Internet & American Life Project found that 72 percent of those surveyed believe all or most of what they read on health websites. Actually, most of such web sites are only interested in doing{#blank#}8{#/blank#} business. Of the 169 websites the researchers rated, only 16 scored as "high quality". Recent studies found faulty facts about all sorts of other disorders, causing one research team to {#blank#}9{#/blank#} that a large amount of incomplete, inaccurate and even dangerous information exists on the Internet.

    The problem is that most people don't know the safe way to surf the web. "They use a search engine like Google, get 18 trillion choices and start clicking. But that's risky, because almost anybody can put up a site that looks {#blank#}10{#/blank#} , so it's hard to know National Cancer Institute.

    There is a difference between science and technology. Science is a method of answering theoretical questions; technology is a method of solving {#blank#}1{#/blank#} problems. Science has to do with discovering the facts and relationships {#blank#}2{#/blank#} in the observable natural world and with building up theories that serve to organize these facts and relationships; technology has to do with tools, techniques, and methods for carrying out the {#blank#}3{#/blank#} of science.

    Another difference between science and technology has to do with the {#blank#}4{#/blank#} in each.

    Progress in science does not consider the human factor. Scientists make a study of the universe, try to explain the rules of nature and strive to find out the truth. They can {#blank#}5{#/blank#} pay attention to their own or other people's likes or dislikes or to popular ideas about the fitness of things. What scientists discover may shock or anger people—as did Darwin's theory of evolution. But even a(n) {#blank#}6{#/blank#} truth is more than likely to be useful; besides, we have the choice of refusing to believe it! But hardly so with technology; we do not have the choice of refusing to hear the noises produced by an airplane flying overhead; we do not have the choice of refusing to breathe {#blank#}7{#/blank#}air; and we do not have the choice of living in a non-atomic age. Unlike science, progress in technology must be {#blank#}8{#/blank#} in terms of the human factor. Technology must be our slave and not the {#blank#}9{#/blank#}. The purpose of technology is to serve people in general, not merely some people; and future generation, not merely those who presently wish to gain advantage for themselves. Technology must be {#blank#}10{#/blank#} if it is to lead to a better world.