Don't talk in the meetingroom,________?
Unfortunately,at least 20 miners were killed,22 ________ and 13 ________ in the coal mine gas explosion.
—Where did you find the wallet?—It was at the stadium ________ I played football.
The development of industry has been ________ gradual process throughout ________human existence,from stone tools to modern technology.
Tu Youyou was ________ the 2011 Lasker clinical Medical Research Award on September 12 because she discovered a drug called artemisinin ________ against malaria.
It's impossible for her to have more free time to accompany her parents because her work ______ much of their time.