From {#blank#}1{#/blank#} early age he was interested in plants. He {#blank#}2{#/blank#} (study) agriculture in college and as a young teacher he began experiments in crop breeding. He thought that the key to {#blank#}3{#/blank#} (feed) people was to have more rice and to produce it more quickly. He thought there was only one way {#blank#}4{#/blank#} do this-by crossing different species of rice plant, and then he could produce a new plant which could give a {#blank#}5{#/blank#} (high) yield than either of the original plants.

If one wants to keep fit, he should  {#blank#}1{#/blank#} {#blank#}2{#/blank#} instead of taking certain pills, which actually has a bad {#blank#}3{#/blank#}  {#blank#}4{#/blank#} people's health.

    There are two main {#blank#}1{#/blank#} (reason) why the temperature of the air is always {#blank#}2{#/blank#} (change). One reason is that the air around you {#blank#}3{#/blank#} (move) in from somewhere else. Air usually moves in large bodies {#blank#}4{#/blank#} (call) air masses. Some air masses move in from the north. These air masses usually have cold air that causes the temperature {#blank#}5{#/blank#} (drop). Air masses also move in from the south. They usually have warmer air that causes the temperature to rise.

    Temperature changes during the day or night can be great {#blank#}6{#/blank#} small. This depends{#blank#}7{#/blank#} (part) on how many clouds are in the sky. {#blank#}8{#/blank#} there are many clouds during the night, they act like covers on your bed. They blanket the earth and keep the air from {#blank#}9{#/blank#} (lose) much of its heat. The temperature usually does not drop much during such a night. When there are many clouds during {#blank#}10{#/blank#} day, some of the sun's energy will not reach the earth. The temperature usually does not rise much on such a day.

    Jack was in his last year of junior school. He was only 4 feet and 11 inches, overweight. He had little hair and few {#blank#}1{#/blank#} (friend). His grade was not {#blank#}2{#/blank#} (good) than his look. His life was going nowhere. He was having a really hard time because his parents recently got divorced (离婚). But he wanted to change {#blank#}3{#/blank#} (he) so that he could have a fresh start in the high school.

    Jack went to Mrs. Collins, his favorite teacher, {#blank#}4{#/blank#} told him that he had to make small changes first and start with the easier things. Jack went to the hospital {#blank#}5{#/blank#} (solve) his hair problems. He started talking to people more to make friends. He realized that he just had to express himself. He started to study more instead of {#blank#}6{#/blank#} (think) about his parents, He {#blank#}7{#/blank#}(begin) to eat healthily to lose weight.

    When Jack entered the high school on the very first day, he was a {#blank#}8{#/blank#} (total) different person. He was now in good shape, smart {#blank#}9{#/blank#} popular. He also had a nice hairstyle. Everyone wanted to make friends {#blank#}10{#/blank#} him. More importantly, Jack finally became happy and confident through his own efforts.

    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).

    At my first class in the Forks High School, Mr. Banner, my English teacher sent me to an empty desk at the back without {#blank#}1{#/blank#} (introduce) me to the class. It was harder for my new classmates {#blank#}2{#/blank#}(stare) at me in the back, but somehow, they managed. I kept my eyes down on the reading list the teacher had given me. It was {#blank#}3{#/blank#}(fair) basic: Bronte, Shakespeare, Chaucer, Faulkner. I'd already read everything. That was comforting… and boring.