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
Not only________ strict with us, but also ________for us.
--- Nancy is not coming tonight. --- But she______!
Kathy______ a lot of Spanish by playing with the native boys and girls.
. People in Jiangsu Province are proud of they have achieved in the past ten years.
. After he graduated from college, he _______ his father’s business.