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

His friends were ___________and encouraged him to publish his ideas, but Copernicus was cautious.

Mistakes don’t just happen, but they occur for a reason. What we ought to do is find out the reason and then making the mistakes _____________.

It was ______ of you not to give others a ride in your new car.

All the candidates present at the conference have contributed to the development of our country, so they are each recognized specialists in their _________fields.