根据句意，补全单词。

1. The boy wants his father to buy a _____ plane for him as a birthday present.

2. We often play games or go fishing in our _____ time after school.

3. We know Obama is the youngest _____ of the American.

4. Good _____ can help you find good job.

5. There are some _____ in the space such as the earth, the sun and so on.

在企业管理体系中，直线关系实际上是（）。

A.托管关系

B.协助关系

C.命令关系

D.平等关系