—What’s       favorite subject?
—Her favorite subject is math.
　　

1. A.
   Mary　
2. B.
   she’s
3. C.
   Mary’s

—What’s       favorite subject?
—Her favorite subject is math.
　　    A. Mary　            B. she’s                               C. Mary’s

What’s ______ favorite subject?

A. he　　 B. she　　 C. he’s　　 D. Mary’s