To my surprise, I hurried to the lecture hall only ______ that the lecture had been cancelled.
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.