—_____________ do you visit your grandparents?—Twice a month.

One-third of the country____ covered with trees and the majority of the citizens______ black people.

While a huge amount of money ___been spent stopping pollution , large quantities of water_    _still heavily polluted．

The little girl with her classmates _______ playing computer games happily now.

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