The sun has set and we walked as fast as we could, __________ to get there before it was dark.
In my brother's absence, I would like to thank all concerned on his ________.
—What does PM 2.5 mean? —It's a professional ________ indicating the condition of air pollution.
It is no ________ pretending you did not know because everyone saw the whole accident.
—He has a lot of friends who have a lot in ________ common with himself. —Indeed.Birds of ________ feather flock together.
Finding information in today's world is easy.The ________ is how you can tell if the information you get is useful or not.