Creating good habits can be as tough as breaking bad habits. From my experience, one of the most important factors {#blank#}1{#/blank#} make forming a new habit hard is that a lot of willpower {#blank#}2{#/blank#} (require), at least in the beginning, and that alone can prevent many people correctly developing their desired habits.

    Now instead of just using willpower and reminding {#blank#}3{#/blank#} (you) to start the new habit each day, why don't you just link it to an existing one? I have done {#blank#}4{#/blank#} experience. It started with just 20 pushups (俯卧撑), something easy. So before I showered each day, I would do the pushups. {#blank#}5{#/blank#} a couple of days, I increased the amount just to make it a bit more challenging.

    Gradually, over the course of about 3 months, I'm now doing 100 pushups. And as the habit grew stronger, it got easier to do so {#blank#}6{#/blank#} (natural). Now I know the habit is pretty much ingrained (根深蒂固), for I feel like something is missing {#blank#}7{#/blank#} I don't do this before showering. I found it pretty easy {#blank#}8{#/blank#} (create) this habit and not much willpower was involved.

    I think the key, apart from using an {#blank#}9{#/blank#} (exist) habit, is to start out with something really easy. Once that starts becoming part of your {#blank#}10{#/blank#} (day) routine, add on to it.

    It is not a secret {#blank#}1{#/blank#} trees are vital to our life. They provide us with food, wood and most {#blank#}2{#/blank#} (important), oxygen. Now there is one more thing we can add to this list—blocking out harmful bacteria from water.

    The discovery {#blank#}3{#/blank#} (make) by a team {#blank#}4{#/blank#} (consist) of scientists from the Massachusetts Institute of Technology (MIT) and high school students {#blank#}5{#/blank#} were seeking a natural water filter(过滤)—one that would help communities in developing countries that do not have {#blank#}6{#/blank#} (accessible) to modern water filter systems.

    The {#blank#}7{#/blank#} (research), led by Professor Rohit Karnik, decided to turn{#blank#}8{#/blank#} trees for help, because they could allow liquid to flow through, while blocking out air bubbles.

    They began by cutting 1.5-inch-wide sections of tree bark from the branches of a white pine tree. The people related then tested the wood's filtering ability by pouring water containing red dye particles of different sizes through. To their {#blank#}9{#/blank#} (amaze), they found that it was effective in trapping all the particles. Greatly {#blank#}10{#/blank#} (encourage), the team conducted another experiment, this time with water that contained bacteria. Sure enough, the sapwood held back 99% of the bacteria, allowing only 1% to flow through.

    Zoos are places {#blank#}1{#/blank#} animals are kept. There are some reasons {#blank#}2{#/blank#} keeping animals in zoos.

    Firstly, zoos are entertaining and interesting places of children. Most children like to see animals in zoos. Zoos also offer people {#blank#}3{#/blank#} (live) in big cities a chance of getting close to nature.

    Secondly, it is easier for scientists to research animals' lives when they are kept in zoos than they are in forests. Scientists can study animals' {#blank#}4{#/blank#} (relate), their life cycles, or their habits to learn how to breed animals, {#blank#}5{#/blank#} can reduce animal {#blank#}6{#/blank#} (extinct).

    Furthermore, the risk of dying out of some {#blank#}7{#/blank#} (endanger) animals is reduced because they are kept in safety.

    {#blank#}8{#/blank#}, zoos also cause some problems for animals, such as restrictions on their freedom. They also lose their “wild” character. For example, tigers might lose their {#blank#}9{#/blank#} (hunt) skills. Besides, zoos cost a lot of money for land, animals' food and labors. This may charge {#blank#}10{#/blank#} (expense) for people who want to visit zoos.

    When we compare ourselves with great people, we may feel very ordinary (平凡的）unimportant. {#blank#}1{#/blank#}, we must remember that those great people were extraordinary (卓越的) The world has more than 6 billion people, {#blank#}2{#/blank#} it is difficult for all of us to be extraordinary. What can we do? We can try to be the {#blank#}3{#/blank#} (good) people that we can possibly be.

    This means that we Deed to be honest and hardworking. We also need to be open-minded and kind to other people. Most {#blank#}4{#/blank#} (importance), we need to be ambitious (有雄心的). We need to always set goals for {#blank#}5{#/blank#} (we) and work hard to achieve these goals.

    Madam Curie and Thomas Edison were hard-working, kind and ambitious, and they {#blank#}6{#/blank#} (work) hard to achieve their goals. Curie gave her life to “ease (减轻）human suffering”. Edison spent his life as an inventor. He invented a camera {#blank#}7{#/blank#} showed movement. Later people used cameras to make modem films.

    A famous writer from Ireland once wrote, "We are all in the gutter (社会底层）but some of us are looking at {#blank#}8{#/blank#} stars.” I often come up with this when I am unable to achieve something. It reminds me that we are all at a lower level {#blank#}9{#/blank#} that we all have a {#blank#}10{#/blank#} (high) goal to work towards.

    Lake Titicaca, a famous lake in South America, lies on the border between Bolivia and Peru. But the lives of the ancient people, who once lived around the lake and {#blank#}1{#/blank#} culture was thought to be highly developed, have long remained a secret. Recently, however, scientists {#blank#}2{#/blank#}(take) part in an exploration project at the lake have found {#blank#}3{#/blank#} 1000-year-old temple beneath the water.

    Divers from the study group have discovered a building that scientists think is the remains of a temple {#blank#}4{#/blank#}(build) by the people who once lived beside the lake. The project leaders hope to begin raising {#blank#}5{#/blank#}(value) materials from the site later this week {#blank#}6{#/blank#} bad weather forces a change in their plans.

    "The scientists have not yet had the chance to study the materials {#blank#}7{#/blank#}(careful)," said the project {#blank#}8{#/blank#}(found), John Aubi. "But some have put forward the idea that the remains date from this period because they are similar {#blank#}9{#/blank#} those found elsewhere."

    So far, they {#blank#}10{#/blank#}(make) more than 200 dives into water 30 metres deep. During these dives, they have been recording the ancient remains on film. There will be a meeting, starting later this year to review the film.