As is known to all, we live in a world of germs（细菌）. It is impossible to avoid exposure. Genetic makeups may give some people {#blank#}1{#/blank#} advantage over others. However, it does not stop people {#blank#}2{#/blank#}(become) sick.

    All of us have been a victim of an {#blank#}3{#/blank#}(ill) at some point in our lives. Moreover, it is likely that we {#blank#}4{#/blank#}(get) sick again in the future. Our best chances of avoiding sickness {#blank#}5{#/blank#}(be) by exercising and employing good {#blank#}6{#/blank#}(habit).

    While good hygiene and exercise serve as obvious advice to most people, eating healthily is not always obvious. If you cannot define ＂healthy＂, then your immune system will be happy {#blank#}7{#/blank#}(tell) you. The immune system is the foundation of our health. It works for us every day to keep us well. Ask yourself: ＂Are you making its job easier {#blank#}8{#/blank#} harder?＂

    Like any system, the immune system is no {#blank#}9{#/blank#}(difference). It has a tolerance too. If you eat unhealthily, your immune system will make you aware of it.

    Take a step {#blank#}10{#/blank#} the right direction by including some healthy food in your diet.

    Each week New York-based hairstylist Mark Bustos tries to make a small difference in people's lives {#blank#}1{#/blank#} giving haircuts to homeless people.

    During the week,Mark works in his high-class salon,but each Sunday,he walks around the city asking people {#blank#}2{#/blank#} they'd like a haircut.He then gives them a stylish haircut {#blank#}3{#/blank#} same kind he would give to any paying customer, except these are done for free for those who are homeless or cannot afford a haircut {#blank#}4{#/blank#} (them).

    Mark's work began in 2012 when visiting family in the Philippines.Instead of jus {#blank#}5{#/blank#} (take) a typical,relaxing vacation,he decided to give poor local children haircuts."I felt so happy doing it that I've continued since returning," Mark explains.

    Changing someone's appearance can have a huge impact on their life.Remember the homeless retired soldier who received a make-over?He found a job,? {#blank#}6{#/blank#}  (rent)a house and quit drinking alcohol afterwards. {#blank#}7{#/blank#}  (simple) changing how a person looks can give them a huge increase in {#blank#}8{#/blank#} (confident).

    Mark Bustos proves that there are many ways {#blank#}9{#/blank#} (give),and that you can easily use your {#blank#}10{#/blank#} (person) abilities to make a difference in somebody's life.

—Yes, {#blank#}1{#/blank#}.

    Dujiangyan is the oldest man-made water system in the world, and a wonder in the development of Chinese science. {#blank#}1{#/blank#}(build) over 2,200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering {#blank#}2{#/blank#}(achieve) is still used today.

    In ancient times, the region in which Dujiangyan now stands {#blank#}3{#/blank#} (suffer) from regular floods caused by overflow from the Minjiang River. {#blank#}4{#/blank#} (help) the victims of the flooding, Li Bing, the region governor, together with his son, decided to find a solution. Li designed a series of channels built at different levels along Mount Yulei that would take away the floodwater while leaving the river flowing naturally. {#blank#}5{#/blank#} (good) still, the extra water could be directed to the dry Chengdu Plain, making {#blank#}6{#/blank#} suitable for farming.

    Once the system was finished, no more floods occurred and the people were able to live {#blank#}7{#/blank#} (peaceful). Today, Dujiangyan {#blank#}8{#/blank#} (admire) by scientists from around the world because of one feature. Unlike modern dams {#blank#}9{#/blank#} the water is blocked with a huge wall, Dujiangyan still lets water flow through the Minjiang River naturally, enabling ecosystem and fish populations to exist {#blank#}10{#/blank#} harmony.

    When digging outside the city walls, researchers {#blank#}1{#/blank#} (discover) thirty to forty bodies lying one on top of another. They had been murdered.

    The men dug with great care, trying not to disturb the {#blank#}2{#/blank#}(evident) of what had happened. Everyone was curious {#blank#}3{#/blank#}why all these people had been killed at the same time. Was it just {#blank#}4{#/blank#} coincidence?

    Deep in the ground below the bodies, they found a tomb {#blank#}5{#/blank#} was made of stone. It contained many valuable things, {#blank#}6{#/blank#} (include) much gold and many jewels. Inside it lay the body of a man that was {#blank#}7{#/blank#} (good) preserved. It was clear that the man had been a king, {#blank#}8{#/blank#} explained why the other bodies were there. The workers who had built the tomb were killed shortly after the king {#blank#}9{#/blank#} (die). That was because they wanted to keep the tomb a secret, and to make {#blank#}10{#/blank#} (they) companions for him in death.

    Last year, my brother and I went to Miami for a vacation. Some of my friends who had been there before said it was {#blank#}1{#/blank#} wonderful holiday destination. Before we went, we had planned for months. When the day came, we were ready.

    Since it was the first time we {#blank#}2{#/blank#} (be) there, we were pretty excited. After our plane landed, we went to the hotel. We had made {#blank#}3{#/blank#} (we) reservation(预定) six months earlier, but the man at the front desk said there had been a mistake. We {#blank#}4{#/blank#} (tell) that our rooms hadn't been reserved for that week, but for the week after. I didn't understand {#blank#}5{#/blank#} this would happen and my credit card had already been charged for the reservation. What made things even worse was {#blank#}6{#/blank#} the hotel had been fully booked. When we were wondering {#blank#}7{#/blank#}to do, the manager came out. She was very helpful. She apologized for the mistake and {#blank#}8{#/blank#}surprised me and my brother that she should give us a spare VIP room on the top floor. We had never stayed in such an amazing room, and we weren't charged extra.

    The next day, my brother and I went to the beach {#blank#}9{#/blank#} some people were playing volleyball. We got a little sunburnt, but the day had been so {#blank#}10{#/blank#} (relax) that we didn't mind.