It is uncertain ________ side effect the medicine will bring about, although about two thousand patients have taken it.(2010·浙江)

Their products enjoy 30 percent ________ ofthe market in this country because both the quality and their service are fine.

Oh, Mrs King, your necklace looks nice. Is it new—No, I _______ it for 2 years.

It seems __________ the poor guy is goingto die of __________.

“Will you go skating with me this winter vacation?”“It.”