With a record of more than 90 goals in 2012, Messi is considered as the_______ football player in the world.
The first thing _____ I should do is to work out a study plan for the next term.
_____ of the water _____ polluted. We must try to protect our environment.
He is so poor that he has no house _____.
The stones are so heavy. How _____ they _____ to the top of the building without modern machines?
No free plastic bag in the supermarket helps to _____ white pollution.