The rivers will become dirtier and dirtier ______ we take action to protect them.
A. since B. if
C. until D. unless
He is an honest boy. I have no reason to _______ what he said.
A. hear B. doubt
C. repeat D. believe
-- It will be my turn. I feel a little nervous. --________ You can make it!
A. Congratulations! B. Take it easy.
C. kook out! D. Have a good time.
-- What was Jim wearing at the party?
-- Nothing ________. He was in his usual shirt and jeans.
A. special B. simple
C. important D. interesting
—It's so late. Why not write the report tomorrow? —But I don't know _______. I can do it if not now.
A. why B. when
C. how D. where
I will meet Jane at the station. Please ________ what time she will arrive.
A. count B. choose
C. check D. catch
