细胞分裂时，遗传物质的变化是（　　）

    We think that life in Chinese high school is an adventure in which we have to survive mountains of homework and all kinds of exams. Yet would it be____(surprise) if I tell you that high school life in the US is almost as stressful and demanding as it is in China?

    In US high school, everything____(record) into your studying document, including your grades on quizzes, tests and final examinations. Failing____(turn) in your homework on time will directly affect your grade for a certain course. Perhaps contrary to____we used to think of the US high school students, they pay more attention to their____(academy) performance to try to get into a distinguished university.____, they'll be disappointed after graduation from high school.

    Like university students, US high school students have the____(free) to choose the courses that most interest____(they). Even a ninth grader can sit____the same classroom as twelfth graders. But this also means he or she has to work very hard, because the teacher will not treat him or her differently just because he or she is a few years____(young).

    Family values are principles that help to define us as human beings. These values are learned, usually passed down____ one generation to another. However, they can also change over time____(depend) upon the circumstances in which families find themselves. They shape the way we behave, they help families stick together, and they give us our identity.

    We always admire a person____ treats the elderly with respect, or helps people in need, or is always honest with others. Such____ (admire) behavior is usually a direct result of the values that person was taught by his family.

    These values or principles—respect, fairness and____(honest) among many others—also help hold the family together in times of trouble. When problems arise, the family is able to withstand them because they share____ same idea about____ is important. When family members feel pressure from the outside world, they know they can come into their family for a comforting connection.

    Finally, family values make us who we are____we talk about our personal character and what____ (influence) our decisions, we do so based on the values ____ (give) to us by our family.