语法填空

    ____ is well known, optimism(乐观)plays an important role in one's life. Although we are facing many difficulties, we should keep optimistic. Optimism is a mental(精神的)attitude or world view and it means expecting ____ best possible result from any given situation.

    I did ____ (poor) in English in the past, but I never gave up struggling(搏斗). All my families, teachers and friends encouraged ____ (I) and they taught me a lot of ____ (use) ways of learning English. I ____ (keep) practicing as they told me to do. I listened to English news and songs and I read interesting English stories. At weekends, watching some English movies was another good way to make my English better. ____difficulties I came across, I tried my best to work them out. I believe in myself, ____ (believe) that hard work would finally pay off. Gradually, I make progress in my English. Nowadays, I can remember English words ____ (easy) and use them freely when communicating with foreigners.

    Thanks to optimism, I have become one of the top English ____ (learn) in my school now.

在三个不透明的布袋中分别放入一些除颜色不同外其他都相同的玻璃球，并搅匀，具体情况如下表：

在下列事件中，哪些是随机事件，哪些是必然事件，哪些是不可能事件？

下列有关太阳直射点的叙述，错误的一项是（　　）