english is as easy as pie

Answers are here :)

1) b   It's raining cats and dogs =It's raining heavily.

2) c  she had a cow! = My mom was really upset.

3) b  a little birdie told me! = An unnamed person told Susan about Jean's birthday.

4) a   a scaredy cat! = Sam's brother is afraid to ride the roller coaster.

5) a It's a dog-eat-dog world. = Only the strong or the best survive.