At least 450 years ago, corn was____ China.
If you go out, who'll _______ to the baby?
Our cadres, whether high or low in their official rank, are the people's public servant and _____workers.
The servant opened the door and _______me into the house.
Such a grammar mistake is ______ among the beginners of English study.
His cousin, who had just been _______ to Beijing University, was killed in a traffic accident.