He was ______ medical student before he turned _______ engineer.
The man __________ at the meeting yesterday will be our new manager. 【选项 】
Jackson has been out of work for a long time. So he wants to __________ a job in this factory.
In ancient times, people rarely travelled long distances and most farmers only travelled __________ the local market.
Teachers recommend parents __________ their children under 12 to ride bicycles to school for safety.
Sit down, Emma. You will only make yourself more tired, __________ on your feet.