____ wide spread of H1N1 is _____ challenge for the whole world. Confidence, cooperation and responsibility are keys to overcoming it.
New traffic rule says: “Whoever drives _____ a red light will be punished severely!”
“What are you busy for?”—This is a question we very often get _____ nowadays.
—What should I wear to attend our class day? —Dress ____ you like.
—Health goes ahead of everything. —Yes. Keeping _____ balanced diet is good for ____ health.
―Hey, you haven’t been acting like yourself. Everything is OK? ―_________.