We have ________ some organizations to help the poor students in the western areas of China.

My brother often goes out on school nights. —_____and _____.[ ]

Why not_____ us ?—-Because I have a lot of work______.

_______ girl over there is my sister. She wears ________ orange coat.

Alex, how long ____________ you ___________ in this school?–For three years. I’ll graduate in July.