Of the equipment we have produced, this sells best, for it has the advantage over ________ of working efficiently.     

— Finished?— No, I’ve got __________________three questions to answer.

--- Which would you like, rice or noodles?--- _______is OK. I'm hungry.

---Which book do you think is the most useful to my studies?---________, as long as you read it. In fact, they are out of date.

The young member made several proposals, and none of________were considered to be practical or acceptable