改错：Jim and Bob's desks are both white.

改错：My school is about 20 minutes walk from here.

改错：The doctor checked Wang's mothers-in-law heart.

改错：This is a Billy's family's photo.

改错：This is my mother' coat.

---Whose book is it?---It’s ______________.

A. somebody else's
B. somebody's else
C. somebody's elses
D.

I feel terribly hot what’s the______________?

A. temperature of room's
B. temperature's room
C. temperature of the room
D.

The boy talking to Tom is a friend of ______________.

A. Tom's brother
B. Tom brother's
C. Tom's brothers
D.

The woman over there is______________ mother.

A. Mary's and Alice's
B. Mary and Alice's
C. Mary’s and Alice
D.

The guitar is not mine, it's______________.

A. her
B. his
C. your
D. my