根据所给单词，在空格填入一个正确的形式。

1. We want to know _____ (Canada) hobbies.

2. They might organize a stamp _____ (collect) club.

3. She taught _____ (she) English since she was fourteen.

4. He had fun _____ (trade) stamps.

5. Making model train will be an _____ (enjoy) hobby.

船舶设压载水系统的目的是为了（）。

A．增加排水量

B．提高抗沉性

C．增加载重量

D．调整吃水，浮态，稳性