The rivers will become dirtier and dirtier ______ we take action to protect them.
A. since B. if C. until D. unless
It is helpful to ________ a good habit of reading in language learning.
A. take B. show C. develop D. match
-- 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
-- Tony, ________ are you in such a hurry?
-- The meeting will start soon. I don't want to be late.
A. where B. how C. when D. why
I will meet Jane at the station. Please ________ what time she will arrive.
A. count B. choose C. check D. catch
