Everyone knows that many animals eat plants, but there are plants that eat animals. It may sound like a horror story, but there are actually several hundred species of insect-eating plants. Scientists believe that these plants eat insects in order to obtain the nitrogen that is lacking in the soil (1) they grow. The plants digest their food (2) it in powerful acid liquids, very similar to the digestive juices found in humans and other animals.
    Before these plants can begin (3) digestion, however, they must first catch their "dinners." Since insects move very swiftly, and plants are firmly rooted, the plant must (4) some sort of trap for its victim. Insect-eating plants (5) various kinds of traps, some of which operate much better than the traps that we use to catch harmful insects.
    The leaves of some insect-eating plants are covered with a sticky substance. Insects are attracted to these leaves by colors or perfumes. When an insect lands on such a leaf, it sticks firmly, like a butterfly caught in a spider's web. The insect is not powerful enough to (6) from the gummy trap, and the more desperately it struggles, the more immovably it sticks.
    Plant traps that are coated with natural "glue" often have other mechanisms as well (7) they use to secure their prey. A little marsh plant called the sundew has leaves covered with reddish, hairlike tentacles. At the end of each tentacle is a drop of sticky fluid that sparkles like dew in the sun. Flies and other insects are attracted to this sparkling surface, and come to rest upon the leaf. They (8) sticking to the gummy tentacles. But this is not the entire trap; the plant has further surprises (9) store. Almost at once, the tentacles begin to curl around the insect's body. When the tentacles have completely wrapped around the insect's body, they begin to push the captive toward the center of the leaf. Meanwhile, glands in the leaf pour forth an acid liquid which, (10) , starts to dissolve and digest the insect.
(1)     that / what / where / which
(2)    by dissolving / to dissolve / that dissolves / which is dissolving
(3)    at the process of / processing with / to process with / the process of
(4)    catch with / lure / manage for / set
(5)    are built on / are equipped with / provide against / watch for
(6)    escape itself / free itself / prevent / save
(7)    as / what / where / which
(8)    end up / finish / stop / take their life
(9)    at / for / in / with
(10)    at the earliest / at times / for the moment / within minutes