My sister was ________out at night.
—Who’s the man over there?Is he our English teacher? —No,he________be our English teacher.He________be our Chinese teacher because our Chinese teacher is much taller than our English teacher.
“________bookcase is this?”“It must be________.”
The nice hair band must belong to Jane,because she is the only girl here.
The nice T-shirt must be________,because they both like wearing T-shirts.
My mother bought me a book________India.