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.

    UN Chinese Language Day {#blank#}1{#/blank#} (celebrate) yearly on April 20. This year, Doreen Hynd was among those invitees, who are either experts on the Chinese culture {#blank#}2{#/blank#} have a special skill related to it.

    Hynd astonished all those present while performing Tai Chi, {#blank#}3{#/blank#} Chinese martial (武术的) art form, at an event held by the UN Tai Chi Club. The audience could hardly believe she was a 93-year-old grandma. It was definitely amazing that she could bend her body and raise her leg so {#blank#}4{#/blank#} (easy) and keep herself still standing on one leg.

    Hynd owes (归功于) all this to her continuous practice of Tai Chi.

    Born in Australia in 1925, Hynd began Tai Chi training in her 50s and then moved to the US, {#blank#}5{#/blank#} she later became an instructor herself.

    When {#blank#}6{#/blank#} (ask) about the greatest benefit she gained from Tai Chi, Hynd said, “balance.” Hynd has been teaching people of all ages and different {#blank#}7{#/blank#} (culture) backgrounds how to practice Tai Chi. They have benefited greatly from their association with the Chinese culture. They've developed a balanced state of mind and improved their health after {#blank#}8{#/blank#}（month）of practice. Tai Chi allows these people {#blank#}9{#/blank#}（understand）that, from the perspective（视角）of yin and yang, all things are closely connected with each other. This might be where the attraction of Tai Chi {#blank#}10{#/blank#}（lie）. Hynd enjoys sharing this great gift from China with her students.

    The first UN Chinese Language Day {#blank#}1{#/blank#} (observe) on Friday at UN Headquarters in New  York in 2010. {#blank#}2{#/blank#} the world's most widely spoken language, it seems appropriate that Mandarin (普通话) has one day every year dedicated (把…专用于) to it. This {#blank#}3{#/blank#} (official) marked day of Mandarin language celebration was set by the United Nations as a way of celebrating the language's history and {#blank#}4{#/blank#} (contribute) to the world. It is hoped that having one day every year {#blank#}5{#/blank#} (celebrate) Mandarin will encourage more people around the world to take it up. With China likely to become the {#blank#}6{#/blank#} (large) economy in the world, it is important that the wider world becomes interestingly more perfect in this wonderful language. Every year UN Chinese Language Day {#blank#}7{#/blank#} ( fall) on April 20. A great way to get {#blank#}8{#/blank#} (involve) in the celebration is to join a Mandarin class or attend one of the many Confucius Institutes (孔子学院){#blank#}9{#/blank#} are set up in countries around the world. The number of people learning Chinese is on {#blank#}10{#/blank#} increase in China's neighboring countries, such as Korea, Japan, and Vietnam.