Do you always get lost? Don’t worry. When you want to go somewhere, it is _________ for you to find your way by using a map app on your smart phone than before. Your smart phone “knows” where you are and _________ tell you where to go.

This is _________ with the help of satnav(卫星导航) systems. A satnav system uses groups of satellites(卫星) to find out _________ people are. It sends information to a receiver, such _________ a smart phone.

On June 23, 2020, the Beidou Navigation Satellite System was sent up into space. Beidou, China’s own navigation system _________ finally. It is one of the four global navigation systems, along with US’ GPS, Russia’s GLONASS and the European Union’s Galileo.

On July 31, Beidou started providing full-scale(全方位) global services. Now, more than 120 countries and regions _________ Beidou services. Since 2000, China has launched(发射) 59 Beidou satellites. Beidou can be used in areas _________ include farming, public services and business. It can position exactly within 10 meters. In the summer of 2020, people along _________ Yangtze River used Beidou-based device to monitor (监控) flood waters well.

Beidou also has a special messaging ability. It allows people to send text messages up to 1,200 Chinese characters in length __________ mobile phone services are broken by natural disasters. Therefore, it really helps us a lot.

Today Miss White, our history teacher, asked us to make a poster in groups about the culture that we were studying. We were told to write the names of the classmates that we wanted in one group and Miss White would think about our _________.

The next day, Miss White told me to be in a group that I would never like. The boy did too badly in English _________ the two girls often wore strange clothes.

After class, I _________ to Miss White’s office. She looked at me and seemed to know what was there for. I told her I should be in a (n) _________ group. She smiled and gently put a hand on my shoulder, “I know you think you can’t finish making a good poster with them, Ann. But don’t _________ it,” she said, “I know your group needs you. I need you to help them. Only you can help them. And I believe you will do a good job.” I was surprised and moved. Her words gave me _________. I wouldn’t be afraid of it.

Then I bravely walked over to my group. I _________ and we started. Each of us did a part according to our interest. Halfway through the week, I found _________ in our group enjoyed the work a lot. We did a good job together.

_________, our group got an A. But I thought the A should be given to Miss White. We knew we couldn’t make it without Miss White. Her words and smile _________ us to show our potential(潜能).