鲜卑___________于386年建立北魏。439年，北魏统一了______________流域，结束了北方分裂割据的局面。

单词拼写，根据句子意思，填入一个正确的单词。

1. What kind of s__________ do you want to become a inventor?

2. How you're going to i__________ yourself this year.

3. I w__________ if he will come here tomorrow.

4. The young r__________ out and jumped into the water to save the boy.

5. He is f__________ my broken pen.