1. He made ______ breakthrough in his research. As _______ result, he was highly praised.
A.a; / B. /; / C./; a D. a; a
2. --_____ all our efforts, we still lost the game.
--Don’t be discouraged!
A. However B. Despite C. As D. Although
3. --Do you know the man talking to the boss?
--No. Never ______ him before?
A. have I seen B. I have seen C. did I see D. I saw
4. The loud noise from outside ____ everyone who heard it.
A. terrify B. terrified C. terrible D. terrifying