I listened to Dr.Wilson’s lecture about the protection of wild animals,but I was unable to grasp its key _________.
He moved to Germany in _____, when he was in _____.
______ the day went on, the weather got worse.
---- Which city will be host city for the next Olympic Games? ---- London.
Peter’s shoes looked just the same as Jack’s, but it cost _____ his.
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.