The college entrance examination is just around the corner. Homework and tests will keep many of you up late at night, and you may plan to make up for your lost sleep during the weekends. {#blank#}1{#/blank#} is it useful? A study published in the journal Current Biology completely has changed {#blank#}2{#/blank#} people used to think. It shows that the habit of sleeping in on weekends doesn't fix the damage done by a lack of sleep during the week. Even {#blank#}3{#/blank#} (bad), it may damage your health.

Five years ago, I left my job to work on a ship. After working as a junior doctor, I was willing to take the risk.1 for adventure, I boarded a ship in Singapore with 2, 000 passengers and crew. To my2 , the hospital was well equipped, with an X﹣ray machine and a blood analyzer.

As a doctor, I was3 for the 600 crew. Far from4 seasickness and sunburn, I had to deal with other diseases. The ship's medical centre was5 a floating emergency room, and we didn't have a team of specialists on hand for a second6 . With long and unpredictable hours, it required mental7 .

Many of the passengers were elderly. Heart attacks don't8 geography and emergency evacuations （疏散）were difficult to arrange. I recall one such patient, who was taken off the ship halfway through the Panama Canal. After a9 ride in an old ambulance, I was relieved that the patient10 long enough to arrive at the hospital in Panama City.11 , there were several unexpected benefits to the job. I regularly12 the passenger facilities. On rare days off, I13 as a tour guide on trips ashore.

Now, I understand being a ship doctor is not a job﹣it's a way of14 . One year at sea became two. I lost my career ambitions,15 I redefined happiness in my life.

In 2015 my husband and I spent some days traveling in Sahara Desert. I was super 1 to ride a camel for the first time and spent a night in a tent in the desert.

2 , the ride started with me hanging upside down from the saddle (鞍) with one3 in the air. Bob, my camel, had decided to stand up4 I could settle in. I held onto the saddle5 as the guide pushed me up onto the camel's back. Bob6 a sound of disapproval and we rode off. I thought it would be bumpy (颠簸的); but it was a very7 journey all the way8 the fact that the camel in front was having a bad case of gas.

After dinner, we returned to the tent for sleep. Even in several thick blankets, I was 9 from head to toe while my husband fell asleep straight away. Thankfully, I drifted into dreamland gradually, only to be 10 by an unusual noise, followed by a(n)11 smell. I tried to go back to sleep, but another unpleasant smell and more 12 , which went on for hours.

After what felt like a 13 night, it was time to rise to watch the sunrise. I dragged my sleepy body out. There, 14 just outside was Bob, who made direct eye contact with me and I promised I 15 a broad grin on his face.

"I'm going to play basketball, Daddy." Lauren flew into my arms when I came in from work. "That's 1 , honey," I replied naturally. I thought she meant outside the house—on the driveway. Into the kitchen, my wife Helen's silence indicated I had 2 something. After a while, she spoke slowly, "Lauren is joining the girls' high-school basketball team."

I 3 my girl's sportsmanlike courage, but 4 was still in my stomach. Lauren was only just 1.55m tall. 5 legs and a heavy body were surely a(n) 6 for her in playing basketball.

Finally, the game day arrived. Lauren and her teammates moved out. Their game faces seemed 7 to win. At first, though not playing, Lauren followed the movement on the court and 8 every play. I could even 9 her shout "No way!" when a referee made an unfair call against a teammate. Sitting on the sidelines, Lauren still enjoyed the game very much.

Suddenly, the announcer's voice boomed, "Number thirty-three, Lauren Wray, in." My heart 10 wildly. What if she got injured or other girls on the team made fun of her? But what I saw was that Lauren made every effort to keep pace with the others. Just before the end of the game, they 11 the ball to Lauren. She caught it. She shot. 12 she scored!

The audience began clapping and 13 . Lauren's brown eyes shone as she wiped her sweaty forehead. Lauren's uplifting spirits and impressive performance, wrapped in a small 14 , struck everyone greatly. I felt enormously 15 to have Lauren as my daughter.

Iˈve always loved the ocean. In the {#blank#}1{#/blank#} (seven) grade, I started volunteering at the Monterey Bay Aquarium in California. I was upset to learn that many sea animals eat plastic garbage, {#blank#}2{#/blank#} (think)it is food. 

I decided to do something {#blank#}3{#/blank#} (educate) people about this problem. I held presentations at schools to teach kids about plastic waste. I wanted to reach businesses too. I decided that if I learned of a company{#blank#}4{#/blank#} used a lot of plastic, Iˈd send it an email urging it to cut back. 

One day, I saw a commercial for a health-care company. People in the ad were using plastic straws （吸管）. I found the contact information of the company{#blank#}5{#/blank#} emailed its president. I told him how {#blank#}6{#/blank#} (harm) plastic could be to the environment and asked him to consider using more eco-friendly options. I was so{#blank#}7{#/blank#} (excite) when he wrote back to me. He said he would make sure that the company cut its use of plastic straws in half. 

I kept going. Whenever I heard of businesses using plastic, Iˈd send an email. One of the biggest companies I wrote to {#blank#}8{#/blank#} (be) Alaska Airlines Paris. A company{#blank#}9{#/blank#} (represent) wrote back and told me the airline was switching over{#blank#}10{#/blank#}plastic to paper cups on all of its 1, 200 daily flights. 

Growing up in poverty in rural Kenya,Nelly Cheboi watched her single mother work tirelessly so she could attend school. 

From an early age,she realized that her family,along with others like hers in their village, was1 a cycle that left them little hope. Cheboi attended college.2 a scholarship in the United States,worked odd jobs to support her family,and discovered her3 for computer science. She4 the success in finding jobs to her computer literacy. She knew she wanted to share it with her5 back home. 

Today,she's giving 4,000 kids the chance for a6 future through her nonprofit, TechLit Africa. The organization uses recycled7 to create technology labs in schools in rural Kenya. 

In 2018,she began8 recycled computers. She started small,carrying the machines to Kenya and9 customs fees and taxes herself. TechLit Africa now works with shipping companies to10 the donated computers so it's more cost11 . The donated hardware is12 to partner schools in rural Kenya,where students aged 4 to 12 receive daily classes and13 opportunities from professionals and gain skills that will help improve their education and prepare them for future jobs. 

"My hope is that when the first TechLit kids graduate from high school,they're able to get a job online14 they will know how to code,"Cheboi said. "The world is your oyster when you are educated. By bringing the resources,by bringing these skills,we are15 the world to them. "