My life, as it really is, is always filled with sadness and little joy. However, no matter what happens, I can always face it       .

In July, last year, I couldn't believe the news that I was      to enter the only key high school in my hometown. Then I rushed to my home and told my parents. But my father didn't seem as         as I was. He just kept smoking without saying a word and my mother put her head down and couldn't help _      .

What I saw didn't make me surprised. I knew very well _    my family was like. My mum had been in bed for two years because of her disease. I knew my family lived a hard life and couldn't afford my tuition fee(学费). I felt so upset at that moment but I could say         to my parents.

I decide to help my father with his work to support my family instead of       my schooling.

To my surprise, things completely changed just three days before the beginning of the new term. My head teacher who had taught me three years came to my family with some money, which had been raised(筹集) by my schoolmates. He encouraged me, “Always have    .”

At the same time, my father also earned some extra money, he tried his best to afford part of my tuition fee.

I knew I was such a lucky dog and decided to study harder in return. With tears in my eyes, I stepped into the key high school        I had dreamed of.

I have been studying hard since I entered the high school. Whenever I meet difficulties, I always think of my teacher and schoolmates, and I can always get enough courage to go on. Because I have a college dream and must work hard for it no matter how hard life is. Just as a saying goes, “When one door shuts,      opens in life.”

关于自由落体运动，下列说法正确的是[ ]

A．在空气中不考虑空气阻力的运动是自由落体运动

B．自由落体运动是初速度为零的匀加速直线运动

C．质量大的物体，所受重力大，因而落地速度大

D．自由落体的加速度在地球赤道处最大