Can you imagine waking up each day in a house that is {#blank#}1{#/blank#} (gentle) rocked by the movement of water? Well, for some people this vision of the future may become a reality.

    It is a commonly accepted fact that {#blank#}2{#/blank#} the Earth's temperature rises, the ice caps at the North and South Poles will melt, {#blank#}3{#/blank#} (cause) the sea level to rise.

    So, where does this leave the many countries in the world {#blank#}4{#/blank#}have large sections of their populations living in areas which lie at or below sea level? The Netherlands, for example, is one of {#blank#}5{#/blank#} most highly populated, low-lying countries and {#blank#}6{#/blank#} (battle) with the problem of flooding for years. Further rises in the sea level would result in much of the country disappearing under water.

    Inventive architects may have come up with a {#blank#}7{#/blank#} (solve) to the problem: a house actually built on the water. The basic idea is that houses will have a base {#blank#}8{#/blank#} (fill) with air and a way of anchoring(使固定) them to the ground. This will allow the house {#blank#}9{#/blank#} (move) upwards whenever the sea level rises and sink back down when the sea level drops. So, will {#blank#}10{#/blank#} (float) houses be the homes of the future? For some people there may be no alternative.

    Many of us wake up {#blank#}1{#/blank#} (feel) tired in the morning. Many of us ignore the problem as the day goes on, forgetting that it might have a dangerous effect. Society even glorifies “burning the candle at both ends” as a sign of our {#blank#}2{#/blank#}(devote) to work and family.

    Believe {#blank#}3{#/blank#} or not, all this bad sleep has far-reaching consequences. We do not give ourselves enough chances to sleep. A survey of over 74,000 people found that 35% reported sleeping less than seven hours daily {#blank#}4{#/blank#} average. Furthermore, the quantity of sleep we allow ourselves {#blank#}5{#/blank#} (change) greatly over the past 15 years.

    This lack of sleep can lead to many serious {#blank#}6{#/blank#} (problem). One study found that {#blank#}7{#/blank#} (simple) limiting yourself to six hours of sleep a night for two weeks made performance on a timed attention task as poor as if you {#blank#}8{#/blank#} (stay) up all the night before.

    If you intend to try extending your sleep period, consider giving yourself a chance {#blank#}9{#/blank#}(sleep) longer for a full week. Your body clock might be programmed in a way {#blank#}10{#/blank#} keeps you from falling asleep quickly, but it might let you sleep longer.

    Jane was walking round the department store. She remembered how difficult {#blank#}1{#/blank#} was to choose a suitable Christmas gift for her father. She wished that he was as easy {#blank#}2{#/blank#} (please) as her mother, who was always delighted with perfume.

    Besides, shopping at this time of the year was not {#blank#}3{#/blank#} pleasant experience：people {#blank#}4{#/blank#}（step）on your feet or pushed you with their elbows (肘部), hurrying ahead to get to a bargain.

    Jane paused in front of a counter {#blank#}5{#/blank#} some attractive ties were on display. "They are real silk," the assistant tried to attract her. "Worth double the price." But Jane knew from past experience that her {#blank#}6{#/blank#} (choose) of ties hardly ever pleased her father. Jane stopped where a small crowd of men had gathered. She found some good quality pipes {#blank#}7{#/blank#} sale. She did not hesitate for long: although her father smoked a pipe only once in a while, she knew that this was a present which was bound to please {#blank#}8{#/blank#}.

    When Jane got home, with her small but well-chosen present in her bag, her parents were already {#blank#}9{#/blank#} table having supper. Her mother was excited. "Your father has at last decided to stop smoking," Jane {#blank#}10{#/blank#} (inform).

    A mouse, because of a(n) {#blank#}1{#/blank#} (luck) chance, made close friends with an evil frog. One day, {#blank#}2{#/blank#} frog played a trick on the mouse by {#blank#}3{#/blank#} (tie)a foot of the mouse to his own. At first, both of them joined together and the frog led his friend toward the pool {#blank#}4{#/blank#} he lived, and didn't stop until he reached the side of the water. Then the frog {#blank#}5{#/blank#} (sudden) jumped into the water and the mouse {#blank#}6{#/blank#} (pull) in with him. The frog enjoyed {#blank#}7{#/blank#} (he) in the water, happily dancing and crying

    {#blank#}8{#/blank#}if he had done a great deed The unhappy mouse died soon in the water, and his dead body floated on the surface, {#blank#}9{#/blank#} (fasten) to the foot of the frog. A hawk saw the dead mouse, suddenly flew down towards, caught it and flew away. The frog, still tied to the foot of the mouse, was also carried off as a {#blank#}10{#/blank#} (prison), and he was eaten by the hawk.

    More and more public schools in America make it a rule that students must finish a certain amount of community service {#blank#}1{#/blank#} they are allowed to graduate from high school. They work on projects like making the environment better or {#blank#}2{#/blank#} (feed) homeless people.

    Many school systems in the United States now ask students {#blank#}3{#/blank#} (do) some kinds of community service as part of their studies. Students involved in service projects help {#blank#}4{#/blank#} (they) as well as their communities. They learn about the needs of people and aid {#blank#}5{#/blank#} (organize).For this reason, holidays {#blank#}6{#/blank#} (become) the prime period for volunteer work so far. Volunteers get no pay, but experts point out that it is {#blank#}7{#/blank#} excellent opportunity to learn and practice new skills.

    According to the statistics, more than 60% of young Americans have participated {#blank#}8{#/blank#} different kinds of community service, such as cooking for homeless people, or painting old buildings, etc. Some students like to do their volunteer work in {#blank#}9{#/blank#} (centre) parts of America, but the majority of teens prefer to do it in their hometowns. Tom, a 16-year-old middle school student in California, often {#blank#}10{#/blank#} (do) community service in a local hospital. He works 16 hours every week either receiving calls at the information desk, or helping push patients back to their wards (病房).