According to the article, schoolchildren suffer because of an increasing trend（趋势）to wake up during the night to check social media. Afraid of missing a message or chance to take part in a discussion, teens wake up at all times of the night to go online and join up with social groups. All this happens when they should be sound asleep.
The report gives some worrying numbers. 23% of 12 to 15-year-olds wake up nearly every night to use social media. Another 15% wake up at night once a week for the same reason. As a result, one in three students are constantly tired and unable to do well at school.
So, I'd like to ask you to be responsible when it comes to social media. Be brave and turn off your phones and computers at night. The world won't end and your social media will be waiting to greet you in the morning. I give you my word that you won't have missed anything important.
12．What is the new trend among teenagers?
A．They get up too early in the morning.
B．They have difficulty in falling asleep at night.
C．They wake up at night to get something to eat.
D．They wake up in the middle of the night to go online.
13．How did the author introduce the new trend?
A．By using examples. B．By asking questions.
C．By making a comparison. D．By showing research findings.
14．What is FOMO?
A．A fear of going online. B．A fear of losing touch on social media.
C．A need to go out all the time. D．A need to use the latest technology.
15．What does the writer think of the new trend?
A．It's worrying. B．It's encouraging.
C．It's optimistic. D．It's satisfying.
Swimming is great exercise, and a trip to a pool or beach is a good way to have fun with friends in summer. 16．, so it's important to stay safe as you do it. Here are a few things you can do to swim safely.
17．. Don't swim unless there is a life guard at work. If you're on a beach near the ocean, this is especially. In some places fast-flowing water can move swimmers away without warning. So if a sign says "no swimming", pay attention to it.
Be careful when diving（跳入）into the water headfirst. 18．. In natural water, don't dive unless you know that the water is deep enough. Or you could hurt your head on the bottom, causing injury or death.
Around water, adults should watch children at all times to make sure they are safe. Those who don't know how to swim should wear life jackets. But by themselves they are not enough, so an adult should always be present. If you have to rescue a child from drowning（淹）,a few seconds can make a big difference.
Make sure you have a friend with you whenever you swim. 19．, that person can make sure you get help.
Drink a lot water. The sun's heat and the physical activity may make you sweat（出汗）more than you realize.
By following these simple rules, you can make sure your swim time is safe as well as fun. 20．!
A．That way if something goes wrong
B．Now get out there, and enjoy the water
C．Swim only in areas set apart for swimming
D．Make sure everyone in your family swim well
E. But sometimes swimming can also be very dangerous
F. Most pools have marked deep ends where diving is safe
G. Many children who drown in home pools were out of sight within minutes
Many years ago, when I was working in the emergency department, I met John, an amputee（被截肢者）. John had lost a leg during the war. He was 21 24 years old when that happened, 22 he never felt regretful. John said life had been 23 to him. John loved to stop by to 24 with the nurses. He loved to tell stories of how his family had come to this country. He 25 loved people.
When he learned I was injured in a car accident, John came to 26 me. I was walking my dog. As I crossed the street, a man went through the stop sign and 27 me. My neck was fractured（骨折）. I was so afraid of the operation, 28 that I may not walk again. When John came, he sensed my 29 . He shared with me his own 30 . He transformed（转化）his own attitude to me and 31 me to believe, walk and learn to 32 instead of death. He said if he could 33 it, so could I. He came to see me every day for four whole weeks, until I was 34 enough to be allowed to go home.
Life moved on, and so did I to other areas of nursing, I didn't 35 John for quite some time, but we always kept in touch.