Have you ever got your lunch, but not known where 【小题1】（sit）?   You don't want to sit alone. But you are not sure who would be friendly and let you sit with them.

To solve 【小题2】 problem, Natalie Hampton, 16, created an app called Sit With Us. It is 【小题3】（easy） to find friends in the school dining hall than before. Natalie is from Sherman Oaks, California, US. The free app went online on September 9". Students can sign up a "ambassadors（大使）"for a club. Then they can post "open lunch" events to invite others to join in.

The app 【小题4】（create）by Natalie after she ate alone at her 【小题5】 （seven） grade year. The experience made her feel sad. So her parents made a【小题6】（decide） to change school for her because of that.

People may want to know why you don't just ask to sit down. Natalie said the app stops kids 【小题7】 being refused in front of others. "This way is very private. No one else knows. 【小题8】 it is through the phone. And you know 【小题9】you are not going to be refused once you get to the table,” she told NPR.

At present, the app is used 【小题10】 （wide）. "I had my first club meeting, and everyone was very excited. People have been posting open lunches at my school. So I’m very excited. "Natalie told NPR.

As the weather gets warmer, it’s the perfect time to plan a day at the beach. There, you can enjoy a【小题1】 like swimming, surfing, and building castles in the sand. However, it’s important to keep beach safety in mind.

Now, there is a new AI water management system that can help prevent drownings (溺水). Sight-bit was developed by a company which can be used to help s【小题2】 lives. This program was created later, a【小题3】 its creator saw someone drowning at the Dead Sea. He believed this could have been stopped and s【小题4】 working on this program.

The Sight-bit system works by using cameras at the beach to read the water conditions. The AI is able to w【小题5】 the videos and find dangers. For example, it can tell when the waves are d【小题6】 or if someone is in trouble in the water.

The system can also tell the differences between adults, children and different kinds of boats. The information helps beach safety officers know where and when someone needs h【小题7】. Then they can receive warnings on devices (设备) like smartphones and smartwatches. This way, they can act q【小题8】 to stop accidents.

Now, this technology is used in many places around the world, including p【小题9】 beaches, private clubs, and resorts (度假胜地). The creator’s goal is for every beach to be a safe place where families can enjoy their time w【小题10】 worry. This technology shows how science and caring for others can make a big difference in keeping us safe while we are having fun. It’s a great example of what can be achieved when we use new ideas to solve real-world problems.

You may think that complete wheels are necessary when it comes to bicycles, but one creative 【小题1】 (engineer) recent invention shows that two half wheels are just as good as one full wheel.

Sergii Gordieiev is 【小题2】 engineer and Internet star. He is 【小题3】 (know) for his wonderful inventions. Of these, his latest creation is undoubtedly the most eye-catching. His 【小题4】 (usual) bike has two half rear wheels (后车轮) instead of a complete one, and they work together to do the job of a normal one. As strange as it sounds, this crazy bike shows that two half wheels, when used 【小题5】 (correct), are just as good as one full wheel. The key 【小题6】 this invention is the timing of the split (分裂的) wheels. As one of two half rear wheels is in the air, the other half wheel lands on the ground to keep everything balanced. 【小题7】 a clever idea!

Gordieiev says that even if the wheel is perfect, as he tries to show 0.5+0.5=1, there’s really no good reason 【小题8】 (break) a perfectly good bicycle. From making the rear frame(后车架) of the bicycle longer to 【小题9】 (cut) a wheel in half and making sure they work together to carry out the function of a full wheel, you can’t imagine how much work he has put into the bike.

The engineer adds that he hopes to excite people’s 【小题10】 (interesting) in DIY through his example and encourage them to be creative.