I’m terribly sorry to turn you down this time, but I promise I will ______ to you next time.
If you _____ it , I will lend the book to you.
The cost of oil is less than _______ of gas.
He is too careless and he _______ keys.
Please write your composition ________ line to leave space for the teacher’s correction .
_______ are the days when the teachers were looked down upon .