Mike lives in the country,and he loves playing in the river near his house.But his father gets a job in a hospital in a

Mike lives in the country,and he loves playing in the river near his house.But his father gets a job in a hospital in a big city,and he moves there with his family.
Their new house has a garden,but the garden is very small.Mike is not very happy,“Is there a river near here?” he asked his mother on the first morning.
“No,there isn’t.But there is a beautiful park near here,Mike ,and there is a pool in it.We are going there this afternoon.”
Mike is happier now.
After lunch,Mike and his mother went to the park .Mike wanted to walk near the pool,but there was a sign in front of it.His mother read it to him:Warning:This pool is dangerous.46 people have fallen into it.Mike looked into the pool carefully,and said,“But I can’t see them.”
根据短文内容,回答下列问题
1.Where does Mike's father work now?
2.What does Mike like doing best?
3.Why is Mike happier now?
4.How do you understand the sentence "But I can 't see them.