Some day, our world may {#blank#}1{#/blank#} (fill) with driverless cars. But.{#blank#}2{#/blank#}will we communicate with them if there's nobody in the driver's seat?

    At present, drivers can make gestures like{#blank#}3{#/blank#} (nod) when they let us cross the street.{#blank#}4{#/blank#} self-driving cars don't have this ability.

    The US car maker Ford and its partner Virginia Tech {#blank#}5{#/blank#} (try) to solve this problem. The team is testing a method {#blank#}6{#/blank#}uses light signals. For example, a slow-blinking tight shows the car is coming to  {#blank#}7{#/blank#}stop, and a rapidly flashing light   tells passers-by that the car is about to speed up.

    {#blank#}8{#/blank#} (test) the method on real roads, the team has designed a special suit that looks like a car scat. When a driver wears it, it appears as if the car were driverless.

    The team has {#blank#}9{#/blank#} (successful) collected more than 1,500 hours of data, which has recorded how people interacted with a “driverless” car. Ford says it plans to share the data {#blank#}10{#/blank#} 11 other car makers, which should lead to a signaling system that will be used in every driverless car.

    As you know, science plays {#blank#}1{#/blank#} very important role in our education. Do you want to keep up with the latest research and discoveries in science? There are many good websites {#blank#}2{#/blank#} you can check out the latest in the science world.

    One great site is Science News for Kids. This site reports science news {#blank#}3{#/blank#} (cover) a wide range of subjects. The articles are aimed {#blank#}4{#/blank#} younger readers, but adults will find this site {#blank#}5{#/blank#} (suit) for them as well. Another wonderful site, one that I check out every day, {#blank#}6{#/blank#} (call) Science Daily. The site is {#blank#}7{#/blank#} (constant) updated with news, often about exciting {#blank#}8{#/blank#} (finding) that change how we view the world.

    These sites post the latest stories and also keep all the past articles they post{#blank#}9{#/blank#} (early). That way you can find articles just about anything that {#blank#}10{#/blank#} (be) related to the science fields you are interested in.

    According to a study published in the journal Nature Sustainability in February, China and India are{#blank#}1{#/blank#}(main) responsible for making the Earth greener over the past two decades. Since 2000, the Earth's green leaf area{#blank#}2{#/blank#} (increase) by 5 percent, or over 5 million square kilometers. That's{#blank#}3{#/blank#}area equal to the total area of the Amazon rainforest. It is basically the result of many big tree-planting{#blank#}4{#/blank#}(project) in China and intensive agriculture(集约农业)in both countries.

    China and India contribute{#blank#}5{#/blank#}one third of the increasing greening, but contain only 9 percent of the planet's land area covered in vegetation(植被). China was the major contributor,{#blank#}6{#/blank#} (add) 25 percent to this increase, while India added 6.8 percent.

    Over the past few decades, China has made great efforts to green the land. In 1978, China {#blank#}7{#/blank#}(begin) a national-level forestation project-the Three North Shelterbelt Forest Program, also{#blank#}8{#/blank#}(know) as the “Great Green Wall”. The program has seen many trees planted in northern China to act as windbreaks (防风林). By the end of 2017, the forest coverage rate had reached 13.57 percent, compared to 5.05 percent 40 years ago.

    In the light of China's{#blank#}9{#/blank#}(succeed) in greening the desert, the UN believes the country is a good example for others{#blank#}10{#/blank#}(follow) and has lessons to share with the world.