If these trousers are too big, buy a smaller _______.
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She is the tallest of _____ in the family.
A. any sister
B. all the sisters
C. all her sisters
Today is September 10. It's ______ Day. I'll send cards to my teachers.
A. Teachers'
B. the Teachers'
C. a Teacher's
There is some _____ in the basket.
A. bread
B. hamburgers
C. apples
This is _____ ball. You shoould return it to him at once.
A. the boys'
B. the boy
C. the boy's