Do remember to be ________. We must avoid any possible risks when doing this dangerous chemical experiment—burns, poisonous gases or cuts from broken tubes.

My brother likes eating very much but he isn't very _____ about the food he eats.

______ in his studies, he didn't know that all the others had left.

Tom was at a loss as to how a car worked, so it was ______ that he knew nothing about how to repair cars.

Your story is perfect; I’ve never heard ________ before.