In the eyes of a policeman, it's a usually very dangerous to get close to the _____criminal. He may do anything he would to escape.
I try keeping the meeting short, ______ to waste everyone's time.
Don't call me unless there are some ______ matters.
You will find the laptop well-designed when he ______ it ______.
As we all know, he never ______.
We ______ to clean the blackboard every day.