30.The novels written by the author sell best, but five years ago no one could have imagined how great a role he________in the literary world.
______ for the free tickets, I would not have gone to the films so often.
It’s the third time _____ arrived late this month.
Our classroom is very clean. Do you know who___cleaned it?
—— Was that the new comer who walked by? —— _____.
____being March 12th, they planted trees on the hill.