题目内容：

根据句意，用所给单词的适当形式填空。

1.Apple Corporation’s __________ (produce) are very popular all over the world.

2.Wang Yaping, China’s __________(two) woman astronaut, gave us students a lesson about space science last year.

3.We are certain about the result of the problem, but what caused it is still__________ (known).

4.Chinese is __________ (wide) used in Southeast Asian countries like Singapore and Malaysia.

5.I knew the earth ___________ (move) around the sun when I was very young.