根据句意及所给汉语提示完成单词。

1. The old woman is crying _____ (悲伤). What happened to her?

2. I've _____(刚刚) known it. Sorry to hear that.

3. Kitty got _____ (结婚)  last year. Her husband is a computer programmer.

4. The plane _____ (降落) at six this morning. Everything was OK.

5. How many _____ (街区) are there in your hometown?

天体系统级别由低到高依次是地月系、太阳系、银河系、河外星系、总星系。