Over the last 150 years, the field of medicine has accomplished many astonishing things. Some of these medical     1     are well-known, antibiotics, vaccines and organ transplants, for example. Here are three success stories in the world of medical science.

On July 2, 2008, D’Zhana Simmons from South Carolina was given a heart transplant. She     2     Kfroma condition called dilated cardiomyopathy(扩张型心肌病), which meant that her heart was weakened and her blood wasn’t being pumped efficiently. Her new heart failed to     3     properly, so doctors fitted two pumps to keep her blood     4     while they went looking for a new heart. It was almost four months later, on October 29, that another transplant was carried out successfully. In     5    , she’d lived without a heart for 118 days. This is thought to be the longest a pediatric patient has been kept alive without any heart at all.

In1999, a patient in a persistent vegetative state(植物人状态) due to a motor accident was seen to be twitching(抽动) by one of his nurses. His doctor     6     a common sleeping pill, zolpidem, in case this twitching was caused by discomfort. The doctor crushed it on a spoon, fed it to the patient, and was shocked when just half an hour later, the comatose(昏迷的)person made a noise for the first time in five years. This simple     7     has since been tried with several other patients with marvelous results. Not all patients respond--in fact, around forty percent don’t show any improvement--but those who are successfully rescued from their comas are finally able to     8     their loved ones, and even have conversations.

Blindness is not a single, uniform condition; it can be variously caused by problems in the eyes, the nerves and the brain. Thanks to machine implants, people who were completely blind sometimes become capable of    9     colours and describing objects.

The device works like a digital camera, creating an image and then sending signals through nerve cells to the brain. Doctors were also able to restore sight to a man who had been blind for forty-three years; they did this with the help of stem cells, one of the most     10     fields in medicine. Neither of these treatments are yet perfect, but they show what science may be capable of in the future.

Nowadays, there is widespread     1     over students’ loss of independence in study. In terms of academics, some students spend a     2     of time in study but fail to     3       to what they were expected. Over time, some even     4       under the pressure of study. Students who aim to be efficient and     5     learners should become more independent of their teachers. In high school, the change of the learning style is a     6     step toward success. For those who often     7     into a dreamworld of their own when faced with difficulties in study, teachers should guide them out of their comfort zone and help them     8     any pent-up (压抑的) feelings and find passion. As students practice independent learning, encourage them to     9       of changes. Scientific reports have     10     a connection between learning style and academic performance. Throughout learning process, students have     11       numerous situations which shape them who they are today and contribute to their personal growth.

Every small change in learning strategy has a(n)     12     -whether big or small-on students. The ability of     13     challenges     14     opportunities is a valuable skill that can     15     influence their learning career positively.

Online, where posts can spread rapidly and everything leaves a trail, words can also be harsh. Often the only defence people have is     1    their online profiles entirely. But that means giving up a way to interact with others in a positive way. Bullying happens where young people spend their time-at present, mainly Weibo, Wechat, Hupu and Tieba. A widely suggested “solution” is to     2     teenagers to particular platforms. But then they will migrate to others.

Facebook and Instagram use artificial intelligence to spot verbal     3    . Most social-media sites have instructions on how to report     4     material and block other users. For example, Facebook this week announced new ways for users to avoid “unwanted, offensive or hurtful experiences”. However, a(n)     5     survey in Britain found that 70% of people thought that social-media companies do too little to prevent bullying.

More school-aged children have reported being cyberbullied than before the pandemic, according to the report     6    by the World Health Organization (WHO). The study surveyed more than 279,000 young people from 44 countries and regions. In Wales, where nearly 37,000 young people were surveyed, 17% reported falling     7    to cyberbullying. The Health Behaviour in School-aged Children (HBSC) survey suggests the proportion of adolescents who reported being cyberbullied has witnessed some     8     increases since 2018, from 12% to 15% for boys and 13% to 16% for girls.

Dr Hans Henri P. Kluge, a WHO     9    , said: “Focusing on virtual types of peer violence is now a priority to safeguard the health and     10     of populations of adolescents and young people, and cyberbullying must be viewed as a major issue for societies.”

The recorder (竖笛) is an instrument of “incredible functions” for too many generations. But now, it faces extinction. Fewer and fewer people     1     it,with one of the UK’s top music schools reporting an 80% drop in the number of young people playing it in the last 10 years.

Tom Redmond, the principal of Chetham’s school of music in Manchester, said only three of its pupils practised the recorder,     2     15 a decade ago. “More pupils were playing the piano or other instruments,” said Redmond. “The ones which have really flourished are the ones spent more time alone playing. Whereas the instruments that are more socially or orchestral based, like the recorder     3     there has been a decline. Plus, pupils now have more alternatives when     4     a hobby.”

Redmond also said that this problem     5     great attention because it extended “beyond the recorder itself and was a reflection of the future of music. “Like removing any plant or animal from an ecosystem, removing the recorder has a huge ripple effect beyond just the instrument.” he said.

The instrument is     6     revival and its future is so threatened that the European Recorder Teachers Association is trying to     7     again so it does not go the way of the lute. Chris Orton, a recorder tutor and chair of the ERTA, is leading the fight against the instrument’s extinction. When receiving an interview     8     the association, he said, “The recorder is increasingly overlooked by students, and yet it has a rich history and incredible attractions. Bands like Led Zeppelin and the Beatles have used the recorder in their songs. As well as     9     beautiful sounds, it’s an accessible instrument in that it is low-cost compared to other woodwind instruments, and it’s light and easy to carry.” Chris Orton hopes more young students can take up the recorder.

    10     his call, Anna Williams, one of the three students practising the instrument at Chetham’s will be the first recorder soloist to perform with the Chetham’s Symphony Orchestra in the Bridgewater Hall in July, acting as a role model to show the value in the instrument.

Raising a teenager today can be a challenging job. Long gone are the innocent     1     when you could have him accept your values or accomplish what you think the most important thing.

Today’s teens spend an average of 7.5 hours a day     2     to some type of electronic device and most know more about the Internet than their parents. This means they are potentially     3     to a lot more trouble than previous generation. It’s every parent’s first     4     to keep their children safe from harm or to rescue them before they     5     the consequences. Children need their parents to look after their welfare even if they are too     6     to understand and express that need.

However, protections such as parental control     7     can easily be turned off by skilful computer users. “Friending your child on Facebook doesn’t work     8    , either, as it offers users multiple ways to hide content from certain friends.

One of the best of these new services is TeenSafe.com. It’s an online service that allow parents to     9     their children’s mobile, social and Web activities, all in one place. The program can be easily customized for every family’s     10     needs to ensure that everything is okay online.

Last year, there was a shy girl in my class named Lily. I found my teaching on the maths problems didn’t     1     to her. Worse still, she wanted to give up     2     of failing. Just then, her best friend Ted arrived and saw her dilemma. He knew he had to     3     her confidence. With patience and encouragement, he helped Lily     4     the problems step by step until she began to understand. Gradually, Lily could    5     from within and continued to work hard. Thanks to Ted’s firm support, she not only solved the maths problems but also gained a newly-found confidence in her abilities.