They are still very cautious about ________ side effect the new medicine will bring about, although the experts have tried it on about 2000 patients.
--___ today? ---It's sunny.
Don't worry about ___ haven't arrived yet.
It is ___ we depended in Japan.
How long did it take them to get ___ this river? A.through B,over C.across D.till
This is an illness that can result in total blindness ________ left untreated.