If anyone happens to drop in while I am out, _________ him or her leave a message.
¾ Are you waiting for a bus from Medical University? ¾ Yes. I arrived here at the bus stop ten minutes ago, but the bus _______.
¾ Who invented _______ cell phone? ¾ I don’t know. Maybe _______ European.
¾ Will you spare me a few minutes now? ¾ _______. But I’ll be free in half an hour.
—I must thank you for taking the trouble to look after my sick mother. —_______.
The teacher had the students __________ all the words they didn’t know.