读下面这段文字,根据拼音写汉字。
在海边,我jiǎn____起了一枚小小的贝壳。贝壳很小,却非常坚硬和精zhì____。看着它,我轻轻地叹息:“这是一kē ____怎样固zhī____又怎样简单的心啊!”
-----______ there any living things on other planets ?
-----I have no ideas. Maybe we can know more about that in the future.