A number of tests have been conducted to _________ that these drugs have no side effects.
Misunderstandings ________ from lack of social communication, unless ________ properly, may lead to serious problems.
________ enough money, Li Hua was unable to buy the new house.
Despite the government's measures to cool the house market, housing demand in China still grew steadily in the second half of 2012,________ a rapid rise in house prices.
(2013·长春市二模)Unfortunately, we rushed the fallen old man to hospital, ________ that we were responsible for him.
.(2013·江西九江高三二模)________ around the university, we then were taken to a building, where many scientists worked.