–Is ____ your family photo?--Yes,_____ are my parents. 

The number of the classes in our school is __________ than__________ of any other school in Nanjing．

 More and more people find ______ necessary to protect our earth. 

Wearing red can make ______ easier for us to take action.

—Is the boy in white clothes your friend, Kangkang? —No. ____ in black clothes is.