-Hello! Is Mr. John in the office?-Yes. But I'm sorry. He is busy __________ and can't speak to you.
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.
_____ hard, you will succeed.