—Shall I help you with the math problem?—________.
_____ to give up smoking, he threw away his _____ cigarettes.
I can’t remember how many years ago _____ a fight broke out between the husband and the wife.
_____ surprised me most was that he made the same mistake again.
Recently my father bought an ancient Chinese vase, _____ was very reasonable.
I was just going to cut my rose bushes but someone _____ it. Was it you?