完形填空

     My home is quite far away   1  school. It's about 15 kilometers. I have to get up very   2   every morning. First, I walk to the   3   . It takes me about five minutes.

Then I   4   the bus. Because I have   5  time to eat breakfast at home, I always eat it 6  the bus. Twenty minutes later, I   7 the bus. And then I take   8   bus or the subway. It takes me minutes by bus and 10 minutes by subway. Sometimes  9the bus is too crowded, I have to take the subway. Although it is also crowded, the subway is faster than10

    人最宝贵的是生命________生命对每个人只有一次。这仅有的一次生命应当怎样度过呢________每当回忆往事的时候，能够不为虚度年华而悔恨，不因碌碌无为而羞耻；在临死的时候，他能够说________我的整个生命和全部精力，都已经献给了世界上最壮丽的事业________为人类解放而进行的斗争________

下列各项中，属于裸子植物和被子植物共同特征的是（　　）

B元素的离子结构示意图为： ，该该元素的原子的核外总共有____个电子，A、B元素形成化合物的化学式为____．