In our school, some students are active______ some are shy, yet they can be good friends with one another.
______ acupuncture developed, the simple “bian stones” were replaced first by stone and pottery needles, and ________ by metal needles.
Most of our dreams that used to be impossible have ________ true.
The little girl ________ a cry at the sight of a big snake.
Penicillin was then produced ________ in order to meet the demands of the armies.
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