下列各句中，没有语病的一句是（ ）

In 1969, Neil Armstrong, an American astronaut, _____ the moon for the first time, which announced man began to march at the universe. [ ]

______ there any living things on other planets —–I have no ideas. Maybe we can know more about that in the future.

My parents like the music ____ is quiet and gentle.

Liu Wei _____ from home for two years, and she misses her family very much.