1．He is always at the__________(lead) edge of scientific research.
2．Do you know what led__________the outbreak of World War I?
3．He was brought__________in Missouri, along the Mississippi River.
4．She seemed intelligent and well__________(educate)．
5．Although he had little formal__________(educate), he could read and write well.
6．When I arrived there, Mary was looking around in search____her missing dog.
7．The couple went through all their pockets to search________their passports.
8．The fact that he didn't speak a foreign language put him at a distinct__________(advantage)．
9．Being tall gave him an advantage__________the other players.
10．The factory wants to replace most of its workers_______robots.
11．Large quantities of oil__________(be) imported from abroad every year.
