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
Faced with the bad economic situation overseas, more Chinese students are returning home after studying abroad, a _______ that looks likely to continue in the coming years, a report released this week says.
The nine-hour college entrance examination is taken just once a year and is virtually the sole determinant of _______ to all Chinese colleges and universities.