根据句意和所给汉语完成句子.每空一词.
There is a big park (在旁边) the supermarket. I prefer to take a walk there.
Don't worry! We are old enough to look after (我们自己).
When she's at home, she prefers the music that isn't too loud.
The harder you work, the luckier you will become.
The machine is hard to (控制). There must be something wrong with it.
Professor Xu gave us a talk on how to (保护) the environment last week.