By playing with the native boys and girls, one can ______ a lot of their language.
______ 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.
He turned down the request of his friend because it was________the limit of his power.