选用方框内所给短语的正确形式填空
animal sign  in all  depend on  believe in
through hard work
【小题1】I ____________________ the friendship between them. Both of them have been good friends for years.
【小题2】In fact，we can all get ahead in our studies ____________________.
【小题3】He could not work and so he had to ____________________ his family.
【小题4】A person's ____________________ has something to do with his or her birth year.
【小题5】There are fifteen books on the first shelf，twenty-one on the second，that makes thirty-six ____________________ .