you’ve understood all these rules，you’ll have no further difficulty.
A. Unless B. Although C. Until D. Once
______ time, animals have developed many ways to stay away from their enemies.
A. Through B. On C. By D. Over
Let me say sorry to her? No way! I would die I apologize to her!
A. after B. before C. until D. while
--Why didn’t you tell him about the result of the test?
--He rushed out of the room ______ I could say a word.
A. before B. until C. when D. after
________ both sides accept the agreement will a lasting peace be established in this region.
A. Unless B. As long as C. If only D. Only if
Wild animals ________ tigers and pandas are becoming rare.
A. as follows B. for example C. such as D. for instance
