______ he talked with her for a long time, he failed to convince(说服)her.
Because of the nuclear radiation (核辐射), many people ________Japanese food.
Water is much more precious than electricity, for the water for drinking is__________.
Linda doesn’t swim as ________as Ken.
Stanford University is the second ________university in the world.
I’11________photo taking after I retire. I think it is a good hobby.