我国国旗的颜色有：________
A. red and white
B. red and yellow
How many ________ are there in the classroom ?
A. student B. children C. boy
Helen always sends __________ emails to her friends .
A. an B. a C. some
My grandparents often _______ films on Sunday evenings .
A. watchs B. watches C. watch
The _______ girl is my little sister .
A. two B. second C. one
What do you usually do _________ Christmas ?
A. on B. at C. in