―Did you meet Professor Johnson? ―Yes, but when I arrived, he ________, so we only had time for a few words

At present, one of the best ways to study is working in groups.—More chances ___________ to students to learn from each other.

ennifer stepped in quietly, her mother, ____ onthe bed, was sleeping sound.

_______ is well known is ________ theDiaoyu Islands have been part of China since ancient times.

You _____ such a serious mistake if you had followed his advice.