--- Would you please explain to me about the difference between the two words? --- I’m sorry, but that’s I’m puzzled about.
The old man leads ______happy life now, but he will never forget ______hard time when he was poor.
---I regret _____you John has been fired. ---I can hardly believe my ears.He’s such a fine worker.
---Alice, you look puzzled, Have you understood it? ---No.I _____another problem just now.
How pleased the detective was _____what his customer told him!
She looks forward every spring to _____the flower-lined garden.