How close parents are to their children ________ a strong influence on the development of the children's characters.

―It’s snowing outside. Why not ____________ it.―Good idea! 

The number of the students in our grade _______about ______，and     of them are girls.

Millie’s eyes ________ dark brown and her hair ________ black.

—Remember that where and when two different English question words___________. —I see, but can you tell us how to use them, sir?