“Hope for the best and prepare for the worst.” is a proverb, ______ life is beautiful and full of frustrations as well.
We’ll carry the work through , cost _______ it may .
Persist to the end , _______ you are the only one left.
He always talks _______ he had been to outer space.
You’d better come back earlier _______ it is getting colder.
He was walking along the sands _______ he saw a big foot-print in the sand . A. whileB. whenD. asD. after