We all know that a bright future will ______those who always look ahead instead of looking back.

It’s unwise of you not to       his suggestions, for he is an authority in this field.

—How about your travel? —You can hardly imagine what difficulty we have had ___________ the vast desert.

There is still much to discuss. We shall, ______ , return to this issue at our next meeting.

I was making copies at work, and someone came into the room while talking on his cell phone. Should I have left _____ him privacy?