In my opinion, the reason why  
people
  usually
 like keeping  
pets
 is  
because
  pets
 can  
easily
 become  
good
  friends
 with  
people
. To clarify, there are  
a lot of
  people
 who are too shy to communicate or to interact with other  
people
 and it  
make
 them don't have  
a lot of
  friends
 and become a best  
friend
 to  
show
 their true self.  
Therefore
, I  
think
 keeping  
pets
 like cats or dogs is the best choice for them to have  
friends
 due to the fact that everyone can  
easily
 play with them without thinking how to satisfy their feeling like other  
people
.  
For example
, in Japan, there are  
a lot of
 young  
people
 who too shy to communicate with others,  
therefore
 they  
usually
 keeping  
pets
 to become  
good
  friends
 with them.  
So
  as a result
, I  
think
  people
  love
 keeping  
pets
  because
  pets
 have  
enough
 reason to be  
good
  friends
 with  
people
.
In my opinion, the reason why  
people
  usually
 like keeping  
pets
 is  
because
  pets
 can  
easily
 become  
good
  friends
 with  
people
. To clarify, there are  
a lot of
  people
 who are too shy to communicate or to interact with other  
people
 and it  
make
 them don't have  
a lot of
  friends
 and become a best  
friend
 to  
show
 their true self.  
Therefore
, I  
think
 keeping  
pets
 like cats or dogs is the best choice for them to have  
friends
 due to the fact that everyone can  
easily
 play with them without thinking how to satisfy their feeling like other  
people
.  
For example
, in Japan, there are  
a lot of
 young  
people
 who too shy to communicate with others,  
therefore
 they  
usually
 keeping  
pets
 to become  
good
  friends
 with them.  
So
  as a result
, I  
think
  people
  love
 keeping  
pets
  because
  pets
 have  
enough
 reason to be  
good
  friends
 with  
people
.