Since we ____ for almost two weeks, I’ll need to buy a large backpack in advance to carry my supplies of food and water.
The bus __________ passengers outside the airport.
—Is the dentist at work?—I'm sorry to tell you he is on __________.
—Peter's rarely ill,__________ he?—__________. He is quite healthy.
The Smiths felt __________ about their daughter who had gone to the clinic for three hours.
—I'm leaving for the doctor's this afternoon. —OK, but make sure __________ when you leave.