People have planted a lot of trees and grass in order to ____ wind and sand in the desert.
_______ I admit that there are still some problems about the traffic in this area, I don't mean that it can't be solved.
--I'm going to the post office. --_______you're there, can you get me some postcards?
Are you paying now, or shall I ____ to you?
These winners from that key school are wise and diligent, actually there are _ ____students in that school
There is an increase of 16% in the consumption of tobacco______ the previous year.