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.

    I enjoy{#blank#}1{#/blank#} (climb) mountains whenever I can find the time to do so. Tom and Mike are my best friends. Both of {#blank#}2{#/blank#} also like sports. Two years ago, the three of us {#blank#}3{#/blank#} (go) up to Mt. Lushan. Instead of taking a bus, which would be {#blank#}4{#/blank#} (comfortable), we preferred to climb. We started {#blank#}5{#/blank#} the foot of the mountain early in the morning, chatting all the way. After about one and a half hours' climbing, we saw two mountain {#blank#}6{#/blank#} (path) before us. We could not decide {#blank#}7{#/blank#} to choose. In the end, we took the path on the right, thinking that might be a short cut. But we were wrong. {#blank#}8{#/blank#} (lose) in the mountain, we could not find our way out. We had to use our hands and feet to make a way. We began to cry for help {#blank#}9{#/blank#} nobody answered. It was not until darkness {#blank#}10{#/blank#} (fall) that we found a right path leading up to a paved road.

Dear professor Gary,

    I'm {#blank#}1{#/blank#} (terrible) sorry for using the mobile phone in your lecture last week.  I admit {#blank#}2{#/blank#} (make) a mistake and I deserve any {#blank#}3{#/blank#} (punish) for being such a rude student. But I didn't use the mobile phone {#blank#}4{#/blank#} design. I was trying to find a part-time job and that day, a company e-mailed me a job offer and I {#blank#}5{#/blank#} (require) to present my further information without any delay. As {#blank#}6{#/blank#} result, I had to try {#blank#}7{#/blank#} (send) them a text message in class. I promise it will never happen {#blank#}8{#/blank#} me again. But I do need my phone with {#blank#}9{#/blank#} I could communicate with others. I would be grateful {#blank#}10{#/blank#} you could give it to me this time.

    Thank you.

Tom

    Rivers are one of our most important natural resources. Many of the world's great cities are located on rivers and almost every country has at least one river {#blank#}1{#/blank#} (flow) through it, which plays an important part in the lives of {#blank#}2{#/blank#} (it) people.

    Since the beginning of history, people {#blank#}3{#/blank#} (use) rivers for transportation. The Yellow River and Changliang River play a large role in China. The Mississippi, the {#blank#}4{#/blank#} (long) one in the United States ever influenced the American people {#blank#}5{#/blank#} (great) in history. The lifeline of Egypt is the Nile. Rivers provide fresh water {#blank#}6{#/blank#} drink, grow crops, make electricity and chances to have fun for those {#blank#}7{#/blank#} live along their banks.

    {#blank#}8{#/blank#} the cities grow in size and industries increase in number, the river water is severely being polluted. It urges all countries to make {#blank#}9{#/blank#} (decide) and take immediate action to stop it from {#blank#}10{#/blank#} (pollute) any more.

    Many years ago, everyone {#blank#}1{#/blank#}(eat) all kinds of food, especially fruit, vegetables and fish. At the same they took {#blank#}2{#/blank#}(day) exercise. They were very healthy. All of that made a dark witch{#blank#}3{#/blank#}(anger). So she invented a potion which could let people like to eat unhealthy food.

    One day, a little boy found the bottle with the potion.{#blank#}4{#/blank#}(think) that it was some kind of drink, he drank it. A few days later, a strange feeling in his body let the boy lose his appetite{#blank#}5{#/blank#}vegetables, fruit and fish. All he wanted to do was to eat ice cream, pizza, burgers and candy. And because of another strange feeling all over his body, the boy didn't enjoy exercising,  {#blank#}6{#/blank#}. The boy gave up eatinghealthy food and{#blank#}7{#/blank#} (do) exercise at once. Soon his life got more and more boring. He started feeling ill. {#blank#}8{#/blank#}was important to him except sleeping at home. The boy had a disease, the disease of wasting his life. And the worst thing of all was that the disease was infectious. Luckily, Doctor Healthy discovered if a person lived a healthy and happy life, the potion would be{#blank#}9{#/blank#}(use) in a short time. So{#blank#}10{#/blank#}could the waste-of-life disease be cured? The best remedy was not medicine, but just an effort to eat some fruit, vegetables and fish and to do some exercise.

    Two new satellites of BeiDou Navigation (导航) Satellite System (BDS){#blank#}1{#/blank#}(send) into space on a Long March-3D carrier rocket from the Xichang Satellite Launch Center in Sichuan Province, China at 2:07 a.m. on November 19, 2018. The satellites entered a Medium Earth orbit (轨道) {#blank#}2{#/blank#}(safe) more than three hours later and will work with 17 other BDS-3 satellites already in space. They are also the 42^nd and 43^rd{#blank#}3{#/blank#}(member) of the BDS satellite family.

    China launched these satellites with the aim of providing navigation services{#blank#}4{#/blank#}countries and regions which participate in the Belt and Road Proposal by the end of 2018. “This is a key and{#blank#}5{#/blank#}(value) step for BDS developing from a Chinese experimental system to a regional and then a global navigation system,” said Yang Changfeng, chief expert{#blank#}6{#/blank#}contributed much to the BeiDou system. The positioning{#blank#}7{#/blank#}(accurate) of the BDS-3 system has been improved to 2.5 meters to 5 meters, said Yang.

    {#blank#}8{#/blank#}(name) after the Chinese term for the Big Dipper, the BeiDou system has been serving China for 18 years where another six BDS-3 satellites will be put into the Medium Earth orbit from 2019 to 2020. The system is expected{#blank#}9{#/blank#}(provide) first-class services around{#blank#}10{#/blank#}globe by the end of 2020.