While chatting online, some young men tend to expose their ______ to the unknown people as if they were trustworthy friends.
It's surprising that your brother ________Russian so quickly—he hasn't lived there very long.
You'd better________ the instructions so that the children could understand them.
I'd like to take________of this opportunity to thank you for your help.
The head of the company promised to deal with matters of this sort________he returned to his office.
I was not________ that I had cut myself until I saw the blood all over my hand.