Isn’t it amazing how the human body heals ______ after an injury?.

_______ felt funny watching myself on TV.

She tried two different methods, yet ______ of them seemed to work very well．

One choice for me is to study in a university in a large city rather than _______ in a small town. And another choice for me is _______ of studying abroad.

_________ is known to all, the moon travels round the earth once every month.

___________ was most important to her, she told me, was her family.

Since you understand all this,      is no need for me to explain.

—Is there any vaccine(疫苗) against H1N1 flu that can be used on humans?
—No, but scientists are working to develop ________ .

_____is widely known that you value more what you haven’t rather than what you have .

Isn’t it amazing how the human body heals_______ after an injury?