The eyes react______light,as everybody knows

Joe has been studying Chinese for three months．but he can ________ understand people when they speak Chinese．

weight may not be just about what you eatwhenyou eat it, according to a new study．

However busy we are, we need to take exercise. Not only___________us keep healthy, it also stops us getting fat.

After eight hours’ hard work, the firemen the big fire at last.