23.— What do you think of the performance today ?— Great! ___but a musical genius could perform so successfully.
—You have a beautiful garden. May I have a look around it?—I'm glad you like it. Go ahead if _________.
If _________ the same treatment again, he is sure to get well.
—Was his father very strict with him when he was at school? —Yes. He had never praised him _________ he became one of the top students in his grade.
—I wonder if I could possibly use your car tonight. —_________. I'm not using it anyhow.
He _________ the boy's ignorance and sold him a worthless learning machine.