2 . When water is cold, people will find it uncomfortable to swim. Wetsuits(潜水服）can help keep people warm.    1    So wetsuits are important. In many water sports, you can find people wearing them.

The wetsuit doesn't have a long history. According to studies, the wetsuit only began during WWII when Italians started wearing wetsuits that were made of rubber. And it was widely believed in 1951, Hugh Bradner began working to improve the equipment.     2    

Now there are many kinds of wetsuits. Contrary to what some may think, wetsuits do not work by keeping the diver(潜水员）dry; they are designed to let water into the suit. This thin layer of water is trapped（保存）between the diver and the suit. And it's allowed to move between the skin of the diver and the inside layer.     3    And it can help keep the diver comfortable during the diving process. That's why it's important to have a nice, tight fit for a wetsuit.

    4    The shorter wetsuit often provides cover for the main part of people's bodies. This kind of wetsuit works well with boating, water skiing, swimming, etc. A longer wetsuit can completely cover the body, including long legs.With more protection for the body, it may be used in cool weather conditions.

Wetsuits can also differ in thickness. They range from about 0. 5mm to 8mm in thickness. It's true that thicker wetsuits are more likely to affect your movement.     5    Generally, the colder the water you plan to dive in, the thicker the wetsuit should be.

3 . When I was a practice teacher in a middle school，the students in my class were always making ______，and had no interest in chemistry. So I decided to do ______to change their______ towards chemistry.

The evening before I would teach all by myself，I gave a piece of paper to everyone. I told them to write ______ they wanted on the paper and handed it in and then I could tell what each one had ______ .All the students said I _____ be longsighted(远视)．Then I stood ______ my back towards them. I didn't turn back ______ they had finished and ______ all the paper in a cardboard case.

I turned the cardboard case with the bottom(底部)towards the students，and told them calmly what each one had written on the paper. The students were surprised，______ that I had learned their ______ completely in such a short time.

I told them the truth and they were ______ at my brightness：there were five lines of students in the classroom，and every line had ten students. I had written serial number(from 1 to 50 )on every ______ of the paper in a chemical reagent(试剂)that cannot be seen ______eyes，and then gave ______out to the students according to the groups of their seats. After the paper was ______ in，I used______ chemical reagent onto the corner of the paper. Thus the serial number was ______！

______ ，the students became ______ interested in chemistry，and we became good friends.

Lots of foreigners don’t understand why so many Chinese people are sorrowful about Yuan Longping’s passing away.

This reminds me     1     an issue more than 20 years ago,     2     I was a Chinese journalist in the US. Some American scholars     3     (think) China could hardly realize food-sufficiency because of the     4     (limit) water resources, decrease of agricultural land due to industrial     5     (expand) and the fast population growth. Just at that time, Yuan Longping announced breakthroughs in planting the new rice.     6     (bring) to large area application, this technique improved the annual growth of rice greatly, which fed     7     population of 60 million--equal to the whole of the UK.

Western scholars’ prediction of China back then was indeed analyzing China’s problems, but they failed     8     (realize) that the Chinese people have the capability to deal with these challenges.

If they had had any knowledge of Yuan who worked devotedly for our country, they wouldn’t have made such pessimistic evaluations. Why did the Chinese people make     9    ? Why are so many predictions about China in the West     10    (accurate)? It’s time to change minds to better understand China.

Charles Darwin was an English     1     (science) who studied nature. He is known     2     his theory of evolution (进化论)．

Darwin was born on February 12, 1809, in Shropshire, England. In 1831, Darwin boarded a ship     3     (call) the HMS Beagle and set out on a fantastic five­year journey around the world. His goal was     4     (study) the natural history of the areas he was to explore. Darwin was     5     (amaze) at the variety (多样性) of species he saw on his journey. He noticed that although the different islands had similar animals and plants, many seemed to have changed to adapt (适应) to their local environments. He noted some     6     (difference) between the mockingbirds found on San Cristobal, Floreana and two other islands. This led     7     (he) to wonder why they varied from place to place.

Darwin first presented his theory of evolution by natural selection (选择) in 1858 to explain how animals adapted to their environment to survive. The idea of evolution     8     (be) not new then, but Darwin’s theory explained how evolution occurred. When Darwin published On the Origin of Species in 1859, the book was     9     immediate success. However, it was not popular with people     10     believed that all the animals on the planet had been made at the same time by one creator. But Darwin scientifically proved all the species on Earth had evolved from earlier species!

Robert Owens felt     1     (defeat) and helpless on Sunday as he waited in Louisiana’s capital city for one of the most     2     (power) hurricanes ever to strike the US.

The 27-year-old man had spent days     3     (anxious) watching long lines of cars leaving for safer locations as Hurricane Ida     4     (approach). He had hoped that his wife and two children would be among them. But leaving would have required money for gas and a hotel room—something they didn’t have.

Out of desperation, Owens went to the bank on Saturday and applied     5     a payday loan. But he     6     (tell) he didn’t have enough credit history.

“Our bank account is empty-we can’t afford     7     (leave),” he said. “A lot of us here in my neighborhood have to stay and wait, not knowing how bad it’s going to get,” he said. “It’s     8     terrifying feeling to think my family is getting left behind.”

“The fact     9     we are not middle class or above just keeps coming back to bite us again and again, in so many different     10     (direction)and ways. A simple payday advance is just one of them,” he said. “It’s like we have to pay for being poor, even though we’re trying not to be poor.”

10 . In this article, I’m going to show you certain aspects of the Chinese language and explain why they make learning the language a lot easier than you might think.

No verb conjugations (变化)

When you learn English, you need to remember how the verb changes with the subject and time. In Chinese, there are no verb inflections (词尾的屈折变化) at all.     1    .

No grammatical cases

In English, we make a difference between how pronouns are used depending on if they are the subject or the object of a sentence.     2    . None of that in Chinese!

Flexible parts of speech

When learning English, you need to remember different forms of the words depending on what part of speech they belong to. For example, we say “ice” (noun), “icy” (adjective) and “to ice” (verb). These look different.     3    . You don’t know which one it is unless you know the context. This means that speaking and writing becomes much easier since you don’t need to remember so many different forms!

    4    

Word order in Chinese can be a little bit tricky, but it becomes much easier at more advanced levels. As a beginner, there are a few patterns you need to learn, and once you’ve done that, you can just fill in the words you’ve learnt and people will be able to understand. It also helps that the basic word order is the same as in English: subject—verb—object.

What all these boil down to is that learning Chinese needn’t be all that hard. Yes, reaching an advanced level takes a lot of time and effort.     5