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.

    Do you Douyin？

    Got a moment – or, perhaps, 15 seconds? In the age of fragmented (碎片化的) time, Douyin, which is a massive hit in China right now, can perfectly fill in the gaps when people have nothing {#blank#}1{#/blank#} (good) to do between two events; its daily plays {#blank#}2{#/blank#} (spread) over one billion in the past few years. The Meipai(美拍)-like app allows users to produce creative short videos that combine music with mouth shapes or body moves. They can dance, sing, cook or do {#blank#}3{#/blank#} their hearts desire.

    Launched in September 2016, Douyin {#blank#}4{#/blank#} (own) by Zhang Yiming, one of China's top tech leaders; he chairs ByteDance. Similar to how Meipai worked {#blank#}5{#/blank#} a time-limited video platform (平台), Douyin is a {#blank#}6{#/blank#} (collect) of brief 15-second music videos, mainly focused on young people, {#blank#}7{#/blank#} it's certainly suitable for all ages.

    On the platform, childish and strange behaviors are {#blank#}8{#/blank#} (total) acceptable. In high-pressure world, it is no surprise that Douyin has become so successful – all you need to do is pick up your phone and open the app to relieve some stress and have {#blank#}9{#/blank#} laugh. The app pushes related videos and products based on users' preferences and consequently, Douyin can be quite addictive – many people just want to enjoy a few minutes at first, but end up {#blank#}10{#/blank#}  (consume) several hours' video time.

    At 3:42 a.m., everything began to shake. It seemed as if the world was at an end! Eleven kilometres {#blank#}1{#/blank#} (direct) below the city, the {#blank#}2{#/blank#} (great) earthquake of the 20th century had begun. It was felt in Beijing, {#blank#}3{#/blank#} is more than two hundred kilometres away. One-third of the nation {#blank#}4{#/blank#} (feel) it. A huge crack that was eight kilometres long and thirty metres wide cut across houses, roads and canals. Steam burst from holes in the ground. Hard hills of rock became rivers of dirt. In fifteen terrible seconds a large city lay {#blank#}5{#/blank#} ruins. The suffering of the people {#blank#}6{#/blank#} (be) extreme. Two-thirds of {#blank#}7{#/blank#} (they) died or were injured during the earthquake. Thousands of families were killed and many {#blank#}8{#/blank#} (child) were left without parents. The number of people who were killed or injured reached more than 400,000. Then, later that afternoon, another big quake shook Tangshan. More buildings fell down. Water, food, and electricity were hard {#blank#}9{#/blank#} (get). People began to wonder {#blank#}10{#/blank#} long the disaster would last.

    Since {#blank#}1{#/blank#} first fully artificial plastic was invented in 1907, humans {#blank#}2{#/blank#}(find) innumerable uses for the material. It has found {#blank#}3{#/blank#}(it) way into our tools, our clothes and even our bodies. In a new study in {#blank#}4{#/blank#}(environment) science and technology, researchers estimate the average American eats more than 50,000 pieces of microplastic particles, {#blank#}5{#/blank#}(small) than 5 millimeters in length every year and breathes in another 50,000. Although the health {#blank#}6{#/blank#}(effect) of consuming these tiny bits of plastic are unclear, researchers stress the real volume that people are {#blank#}7{#/blank#}(casual) swallowing is alarming. The largest contributor came {#blank#}8{#/blank#} drinking bottled water, in {#blank#}9{#/blank#} the bottle itself added more than 32 times more plastic to a diet {#blank#}10{#/blank#}(compare) with tap water, The Guardian reports.