On a clear February morning, a California black bear was set free. Looking around, he {#blank#}1{#/blank#}(skillful) climbed the nearest tree. From high above the ground, he could see the hundreds of acres{#blank#}2{#/blank#}were now his home. His eyes were filled with {#blank#}3{#/blank#}(curious)

The bear had come a long way. Last fall, the seven-month-old bear bub(幼兽) was found all alone. He had no mother to care for him. He was thin,{#blank#}4{#/blank#} (weight) only 20 pounds—-about half the normal weight for a bear that age. Luckily the bub{#blank#}5{#/blank#}(bring) to The Fund for Animals Wildlife Center in Ramona, California. At the center, the bub shared{#blank#}6{#/blank#} outdoor enclosure(围栏) with another bear. There were trees to climb and places for them to dig dens(兽穴).{#blank#}7{#/blank#} (teach) the cub to find his own food, people working at the center {#blank#}8{#/blank#}(hide) fruit in tree branches. Soon, the bear was an expert at climbing trees and "picking" the fruit. All the staff felt{#blank#}9{#/blank#}(amaze) at his adaptability.

Finally, the day had come. With his new skill and strong body, the bub was ready to be{#blank#}10{#/blank#}his own, and ready to live like a bear should— in the wild.

    On a bright, warm July afternoon, Mac Hollan, a primary school teacher, was cycling alone from his home to Alaska {#blank#}1{#/blank#} he heard quick and loud breathing behind him. “Man, that's a big dog!” he thought. But when he looked to the side, he saw immediately that it wasn't a doe at all, but a wolf, quickly catching up with him. In fact, he {#blank#}2{#/blank#} (meet) some cyclists just 5 minutes before and had just set {#blank#}3{#/blank#} from a gas station, but now no one could help him.

    Mac found out his can of bear spray (喷雾) and fired at the wolf. It fell back, shaking its head. But a minute later, it was by his side again, making him more {#blank#}4{#/blank#}  (fright). He fired at the wolf {#blank#}5{#/blank#} second time, it fell back only {#blank#}6{#/blank#} (start) the chase (追赶) again quickly.

    Mac waved and yelled at passing cars but was careful not to slow down. He saw a seep uphill climb before him. He knew that once he hit the hill, he {#blank#}7{#/blank#}  (catch) up and the wolf's {#blank#}8{#/blank#} (tooth) would be tearing into his flesh.

    At this moment, Paul and Beeky were driving their car on their way to Alaska. They spotted what they, too, thought was a dog {#blank#}9{#/blank#} (run) alongside a man on a bike. As they got {#blank#}10{#/blank#} (close), they realized that the dog was a wolf. They stopped their car in front of him. Mac jumped off his bike immediately and ran for the car quickly.

    A black hole is a spot in space that has{#blank#}1{#/blank#}(power) gravity. Its gravity is so strong that it pulls everything nearby into it, stars, planets and other things. Black holes form when a star dies. When that happens, a huge amount of matter crowds into a very small space,{#blank#}2{#/blank#}becomes very dense. Black holes{#blank#}3{#/blank#}(talk) about in 1783 first. That year, one scientist said that in the universe, there might be places with strong gravity to trap light, although he didn't use the term "black hole".

You Are a Time Traveler

    Time travel has long fascinated people. Traveling to the past or future would allow you to live in exciting periods of history or get a glimpse(一瞥) of {#blank#}1{#/blank#} the future holds. Think about it. If you could travel in time, where would you go? Perhaps you would voyage far ahead of the present day {#blank#}2{#/blank#} (meet)your future self! What about watching an original performance of {#blank#}3{#/blank#} Shakespeare play in Elizabethan England? Or maybe you would pay a visit to {#blank#}4{#/blank#} (you)as a baby.

    Since these ideas are universally appealing to everyone, it is {#blank#}5{#/blank#} (nature)that time travel interests so many writers, filmmakers, and scientists. It has been depicted in a {#blank#}6{#/blank#} (various) of media, such as literature, film, and science reports. But you might be surprised to realize that {#blank#}7{#/blank#} the smallest sense of the term, we are all time travelers. Even as you sit here {#blank#}8{#/blank#} (read)this article, time is racing forward. The future becomes the past as soon as it happens. The present is so fleeting(稍纵即近)! Everything you do quickly {#blank#}9{#/blank#} (become) part of the past, and so it is that we move through time. The famous scientist Albert Einstein, assigned a mathematical formula to this idea, {#blank#}10{#/blank#} is called The Theory of Relativity.

    Keeping a diary in English is a{#blank#}1{#/blank#}(use) way to improve our English writing abilities. Compared with other forms of writing, it is shorter and take{#blank#}2{#/blank#}(little) time. It can help us to develop the habit of thinking in English. If we insist on this practice, gradually we'll learn how to expresses {#blank#}3{#/blank#}(we) in English. Keeping a diary in English, we certainly run up against many difficulties. In the first place, it often happens that we have trouble {#blank#}4{#/blank#}(find) proper words and phrases to give{#blank#}5{#/blank#}(express) to our mind. Secondly, there are many idiomatic(惯用的)words in Chinese. And{#blank#}6{#/blank#}is extremely hard for us to put them into English{#blank#}7{#/blank#}(proper).

    As far as I am concerned, my suggestion is{#blank#}8{#/blank#}we should always have a notebook and a Chinese-English dictionary{#blank#}9{#/blank#}easy reach. Whenever something beats us, we can first put it down in our notebook and then consult our dictionary. We can also turn to our English teacher for help, if necessary. In short, I believe that it is of great use to keep a diary in English for the development of our writing{#blank#}10{#/blank#}(skill).