根据句意及首字母提示补全单词。

1. Kate's mother has gone a_______. She is in New York now.

2. Can you d_______ what is surfing and water-skiing in English?

3. In the past, my grandparents couldn't a_______ education for my father.

4. Keep working hard, and you will s_______ some day.

5. I'm very happy, because I live in a p_______ world, where there is no war.

我国初步建立起社会主义的基本制度，进入社会主义初级阶段是在 [ ]

A．1949年

B．1952年

C．1954年

D．1956年