A study ________ in the U.S.A. in 1977 showed that the chemical ASA in aspirin could prevent a stroke. A. carrying out B. carried out C. working out D. worked out
Listeners are often advised to___what the speaker is going to deliver in his speech as a whole rather than a point or two in it
A new___bus service of Tianjin Airport started to operate two months ago
John was late for the business meeting because his flight had been___by a heavy storm
Last week,parts of China were struck by heavy snow,from___effects the people are still suffering
This is a 24-hour armistice,___it allows the two parties to bury the dead