If the population of the Earth keeps on increasing at its present rate, there will eventually not be enough resources {#blank#}1{#/blank#} (leave) to support life on the planet. By the middle of the 26^th century, if present trends continue, we {#blank#}2{#/blank#}（use）up all the oil that drives our cars, for example. Even if scientists develop new ways of feeding the human race, the crowded conditions on the earth will make{#blank#}3{#/blank#} necessary for us to look for open space somewhere else. But {#blank#}4{#/blank#} of the other planets in our solar system are capable of supporting life at present. One possible solution {#blank#}5{#/blank#} the problem, {#blank#}6{#/blank#}, has recently been suggested by an American scientist, Professor Carl Sagan. Sagan believes {#blank#}7{#/blank#} before the Earth's resources are {#blank#}8{#/blank#} (complete) exhausted it will be possible to change the atmosphere of Venus and therefore create a new world almost as large as the Earth {#blank#}9{#/blank#}.The difficulty is that Venus is much hotter than the Earth. {#blank#}10{#/blank#}, there is only a tiny amount of water there.

    When I left for the United States to study. I had butterflies in my stomach. I was nervous because I was going to {#blank#}1{#/blank#} new place with new people and new customs. I couldn't even understand {#blank#}2{#/blank#}(they)language. Everything was different {#blank#}3{#/blank#} my own country. There was nobody that I could talk to. I just had my husband, {#blank#}4{#/blank#} was a new person for me, too.

    It was a sad moment when I had to say goodbye to my family and friends. I didn't want {#blank#}5{#/blank#}(leave)my hometown because I {#blank#}6{#/blank#}(grow) up there and had wonderful {#blank#}7{#/blank#}(memory) of the place. So, {#blank#}8{#/blank#} (think)about all these changes made me nervous and I was {#blank#}9{#/blank#}(worry)about my new life. But studying abroad was a decision that I made myself. I had to continue and accept the challenge. I looked forward to {#blank#}10{#/blank#}(visit)my family in the summer vacation.

    Two weeks ago, we reported about developments with {#blank#}1{#/blank#} (electricity) planes and flying cars. That technology could bring change to commercial and personal travel. Last week, two {#blank#}2{#/blank#}(company), Kitty Hawk and Uber, announced their plans to bring flying cars to reality. Sooner {#blank#}3{#/blank#}you think, flying cars may appear in the skies. Imagine never {#blank#}4{#/blank#}(have) to worry about traffic, stoplights, or road construction. A flying car could get somewhere much faster than one traveling by road.

    Kitty Hawk is a start-up tech company supported by Google co-founder. Its first flying cars,{#blank#}5{#/blank#}travel at a speed of up to 40 kilometers an hour,{#blank#}6{#/blank#}expect) to go on sale by the end of 2017. Uber expects to launch flying taxis in Texas and Dubai by 2020.{#blank#}7{#/blank#}says its flying taxis could travel up to 241 kilometers an hour, with the travel time {#blank#}8{#/blank#}(reduce) from 2 hours on the road to 15 minutes in the air between San Francisco and San Jose, California. Riders could use the Uber app {#blank#}9{#/blank#}(book) a flying taxi to take them to their destinations. It is estimated that flying taxi travel will be much {#blank#}10{#/blank#} (expensive) compared with road taxi travel.

    In 1955, I got a train ticket to visit my relatives in Cleveland. On my return trip, I met {#blank#}1{#/blank#} handsome soldier. He asked if he could look at the train timetable {#blank#}2{#/blank#} was held in my hand and then if he could sit next to me so that we could chat. I agreed and invited him to share the lunch my aunt {#blank#}3{#/blank#} (pack) for me before leaving. We talked all the way. Finally, we exchanged {#blank#}4{#/blank#} (address) and he said he would contact me.

    After a week, I still didn't receive a letter {#blank#}5{#/blank#} him and began to think he'd forgotten about me. On Saturday, the phone rang and a familiar voice asked if I would like to go out together. We ended up in {#blank#}6{#/blank#} (see) On the Waterfront at the Kallet Theatre. We had a more dates during his Army leave, and then he {#blank#}7{#/blank#} (send) to go overseas. For the next two years, we kept in touch with each other by letter.

    In 1957, we got married. We've been together for more than 60 years, raising three daughters who now have daughters of{#blank#}8{#/blank#} (they) own. Before taking my trip to Cleveland years ago, I was warned never{#blank#}9{#/blank#} (speak) to strangers on a train. I'm {#blank#}10{#/blank#} (certain) glad I didn't listen.

Yangshuo, China

    It was raining lightly when I {#blank#}1{#/blank#} (arrive) in Yangshuo just before dawn. But I didn't care. A few hours {#blank#}2{#/blank#} I'd been at home in Hong Kong, with {#blank#}3{#/blank#} (it) choking smog. Here, the air was clean and fresh, even with the rain.

    I'd skipped nearby Guilin, a dream place for tourists seeking the limestone mountain tops and dark waters of the Li River {#blank#}4{#/blank#} are pictured by artists in so many Chinese {#blank#}5{#/blank#} (painting). Instead, I'd headed straight for Yangshuo. For those who fly to Guilin, it's only an hour away {#blank#}6{#/blank#} car and offers all the scenery of the better known city.

    Yangshuo {#blank#}7{#/blank#} (be) really beautiful. A study of travelers {#blank#}8{#/blank#} (conduct) by the website Trip Advisor names Yangshuo as one of the top 10 destinations in the world. And the town is fast becoming a popular weekend destination for people in Asia. Abercrombie &.Kent, a travel company in Hong Kong, says it {#blank#}9{#/blank#} (regular) arranges quick getaways here for people {#blank#}10{#/blank#}(live) in Shanghai and Hong Kong.