Professor Smith has written some short stories , but he is _____known for his plays .

It is important to keep ______ in an emergency (紧急情况).

We should do more such exercises in the future, I think, _____ those we did yesterday. 

I am well_____of the problems brought about by this new road----it runs right past my school.

— What do you think of investing in today’s stock market? — There are many risks, but also many         gains．