根据汉语意思补上单词。

1. The boy is in the ______(电梯). He is going to the top of the building.

2. —What are you doing?

    —He invited me to his birthday party this Sunday. I want to write him a ______(感谢信).

3. His hobby is playing ______(曲棍球).

4. There are many ______ (婴儿) in the garden. They are playing happily.

5. He usually has lunch at ______(中午).

订货点订货法依靠对库存补充周期内的（）预测，并保持一定的安全库存储备，来确定订货点。

A.需求

B.计划

C.生产计划

D.需求计划