Babies are great and lots of fun. We all love babies and we need babies, too. Many countries don't have enough of them. That's a big problem.

    Most babies grow up to become workers. As the number of workers {#blank#}1{#/blank#} (grow), a country can produce more things. That often means people's lives become easier and more {#blank#}2{#/blank#} (comfort). But without enough babies, a country {#blank#}3{#/blank#} (gradual) gets old. Many countries provide services {#blank#}4{#/blank#} their people like health care. These services {#blank#}5{#/blank#} (pay) for by young working people. But they are mostly used by old people {#blank#}6{#/blank#} aren't working any more. Without enough young people, countries can't afford these things.

    Countries are dealing with {#blank#}7{#/blank#} problems in different ways. Many countries are encouraging people {#blank#}8{#/blank#} (have) more babies. Since raising children is expensive, some countries give families extra money. Some other countries change rules {#blank#}9{#/blank#} it is easier for mothers to study and work. Others are welcoming immigrants (移民) from other{#blank#}10{#/blank#} (place). How do you think this problem should be solved?

    The Great Wall {#blank#}1{#/blank#}(think) highly of by the human race as one of the Seven Wonders of the Ancient World. It lies in North China, with over 6,000 kilometers in {#blank#}2{#/blank#}(long) and 7—8 meters in height. {#blank#}3{#/blank#}(build) mainly with earth, brick and stone, the Great Wall was designed {#blank#}4{#/blank#}(protect) people in ancient China from invaders. However, it is now {#blank#}5{#/blank#}(universal) regarded as one of the most important tourist spots in our country. Every year, it is visited by thousands of people from all over the world. The Great Wall has become a symbol of {#blank#}6{#/blank#} Chinese nation and its culture.

    The Great Wall is wide enough for five horses or ten men to walk side {#blank#}7{#/blank#} side. Along the wall are watch towers, where soldiers used to watch.

    It was very difficult to build such a wall in ancient times without any modern {#blank#}8{#/blank#}(machine). The condition was {#blank#}9{#/blank#} terrible that all the work was done by hand. To be honest, the Great Wall was made not only of stone {#blank#}10{#/blank#} earth, but of the flesh and blood of millions of men.