Hubei Province is _____ the north of Hunan Province.[ ]

How did they come to school today?—Because of the rain they came to school onfoot _____ a bus.[ ]

As we all know, apples are sold by ____ weight, and socks are sold by _______dozen.

What should I buy for Tom’s birthday?— How about ______camera? He loves taking photos.

I was listening to pop songs while my parents ________ dinner yesterday.