There is no _________ that the Great Wall of China is one of the biggest man-made projects on the earth.
While he was at _________ college, he took part in political activities, and was soon thrown into prison.
Supposing someone___________you had been lying, what would you do?
___ makes this shop different is ____ it offers more personal service.
_____ his sister, Jack is quiet, and does not easily make friends.
We do morning exercise every day, from which we ______ a lot.