__________, there will be a day to let the cat out of the bag.
A.However well-kept the secret is B.As the secret is well-kept
C.However the secret is well kept D.Since the secret is well-kept
Once the marine life is poisoned, it will be a very long time __________it restores its original condition.
A.since B.that C.before D.until
__________is a certain doubt among people __________the official advertisement has a misleading effect on customers’ choices of electronic products.
A.It; that B.There; that C.It; whether D.There; whether
We can’t hope to solve all the ecological problems, __________arise directly or indirectly from overuse of the earth’s resources.
A.many of them B.and many of which C.many of those D.many of which
Reporters very often tend to ask such hot questions __________official news announcers would most likely avoid answering.
A.that B.so that C.as D.which
The invention of telegram ________ the transmission of messages to any part of the world within a few seconds.
A.made it possible B.made possible C.made possible D.made it possibly
