—Why ! Where's my passport? Maybe I left it on the plane.--My Goodness ! You ____________ things behind.A. had never left B. didn't leave C. never left
The first textbooks _____ for teaching English as a foreign language came out in the 16th century.
I can’t _____ you running up and down all day long.
Why do you have the water _____ all the time?
Deeply _____, I thanked him again and again.
_____ if he had any difficulties, he made no answer.