All of us are_____aware of the cause of this failure, so do not make the same mistake again.

We should’t only be satisfied with the present life, We are trying to look ______ and see what our future will be like.

I don’t like her face;        , she smokes, which is something I hate.

--___do you clean the reading room? ---Every two or three days.

After two years’ research, we now have a __________ better understanding of the disease.