He gave a ________smile.
The Panama Canal________the Atlantic________the Pacific.
All the preparations for the task________, and we're ready to start.
—I'm sorry I stepped outside for a smoke. I was very tired.—There is no________for this while you are on duty.
—Would you like to go to the dinner party on Saturday?—Thank you. I'd love to,________I'll be out of town at the weekend.
—Haven't you realized the use________the used paper?—Yes, already.