To survive, animals need to find food. Some predators have developed special vision in order to look for prey. Processing eyesight that can be four to five times __26__  than ours, eagles can spot a rabbit from several milesaway. Owls, __27__ hunt at night, have huge eyes for capturing plenty of light and detecting tasty treats in the dark.Like owls, cats see well at night. Their pupils become large circles to let more __28__ in. However, they can’t detect colors. Bees and butterflies, on the other hand, have a range of color vision that extends into ultraviolet – __29__that humans can’t see. For a long time, humans didn’t know how other animals see. Recent studies have shed light on a marvelous world of vision diversity. Understanding the way animals __30__ the world can tell us a lot about their survival strategies.

        A vampire is an undead creature that rises from its grave to feed on the blood of the living. The vampire is ofuncertain origin and can be found in the chronicles of numerous cultures around the world. In Europe, vampires are dangerous adversaries, and should therefore be treated with the utmost__31__ . Their inhuman strength and speed,combined with their rather uncultured refusal todie from most injuries, make them potentially difficult to__32__.In addition, their ability to spread their contagion when they kill means that careless hunters could themselves become vampires—and therefore a danger to their fellows. Though some vampires are__33__  than savage beasts,others are extremely intelligent. Not only can they match wits with their prey, and fight or hunt with great cunning,but some can even masquerade__34__ human beings and live seemingly innocent lives with the societies they victimize. Those vampires who do not thus dwell in villages or cities can be found in a variety of places when not out feeding—ranging from the__35__ in which they were buried to lavish castles in the case of aristocratic vampires.

        Mark is a young man with synesthesia. It is not a__36__ (although it sounds like one), and it does not really have any serious effects on his day-to-day life. However, it is a strange condition. Synesthesia happens when two or more of a person’s senses get __37__ . For example, Mark “tastes” words. His sense of taste__ 38__  when he hears or reads certain words, even if he is not eating anything. For him, the word “box” tastes of eggs.

       His sister is synesthetic, too, and she sees words__39__ color. Hence, when she sees the word “Tuesday” or just thinks of the word “Tuesday,” she gets the feeling of “brown.” Actually, the kind of synesthesia, where the days of the week are colored, is the most common type. Some scholars suggest that synesthesia is__40__  to the way our brains develop language and that there is a link between sounds and shapes.

       A fossil is the remains of an animal or plant that lived long ago. Most fossils are created from the hard parts of ananimal’s body,__41__ bones, shells, or teeth. Some are__ 42__  , like dinosaur footprints. Some are so tiny that you need a microscope to__ 43__  them. Most fossils are found in rocks __44__ from the mud or sand that collects at the bottom of oceans, rivers, and lakes. Fossils provide scientists with__45__   to ancient animals.

       A vegetarian is a person who does not eat meat, poultry, and fish. Vegetarians eat__46__ fruit, vegetables,grains, seeds, and nuts. Many vegetarians eat eggs and/or dairy products but avoid hidden animal products __47__beef and chicken stocks, lard, and gelatin.

      People are vegetarians for many reasons, including __48__for personal health and the environment or spiritualreasons. People may become vegetarians for one reason, and then later on__  49__ some of the other reasons as well.According to the American Diabetes Association, vegetarians are at a lower risk for developing heart disease, diabetes,high blood pressure and breast cancers. This is__50__ a healthy vegetarian diet is typically low in fat and high in fiber.Though being a vegetarian can be a healthy lifestyle, be sure you fully understand why you are choosing vegetarianism.